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Department of Forensics and Investigative Sciences Tatiana Trejos Associate Professor
Eberly College of Arts and Science
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Publications and Presentations

Selected Publications:

  1. Zach Andrews, Meghan Prusinowski, Evie Brooks, Cedric Neumann, Tatiana Trejos. Assessing physical fit examinations of stabbed and torn textiles through a large dataset of casework-like items and inter-laboratory studies. DOI: 10.1111/1556-4029.15452. Selected for JFS social media advertisement and featured in the AAFS Newsletter. 

  2. Prusinowski M,  Tavadze P,  Andrews Z,  Lang L,  Pulivendhan D,  Neumann C, Romero AH, Trejos T.  Experimental results on data analysis algorithms for extracting and interpreting edge feature data for duct tape and textile physical fit examinations. J Forensic Sci.  2023; 00: 1–17.  https://doi.org/10.1111/1556-4029.15449 Selected for JFS social media advertisement and featured in the AAFS Newsletter. 

  3. Logan Lang, Pedram Tavadze, Meghan Prusinowski, Zach Andrews, Cedric Neumann, Tatiana Trejos, Aldo H Romero. Using convolutional neural networks to support examiners in duct tape physical fit comparisons. Forensic Science International. 2023 Dec 1;353:111884. https://doi.org/10.1016/j.forsciint.2023.111884.

  4. Ledergerber TD, Feeney W, Arroyo L, Trejos T. A feasibility study of direct analysis in real time-mass spectrometry for screening organic gunshot residues from various substrates. Analytical Methods. 2023;15(36):4744-57. DOI:  10.1039/D3AY01258A

  5. Vander Pyl C, Menking-Hoggatt K, Arroyo L, Gonzalez J, Liu C, Yoo J, Russo RE, Trejos T. Evolution of LIBS technology to mobile instrumentation for expediting firearm-related investigations at the laboratory and the crime scene. Spectrochimica Acta Part B: Atomic Spectroscopy. 2023 Jul 5:106741. https://doi.org/10.1016/j.sab.2023.106741

  6. C Vander Pyl, K Dalzell, K Menking-Hoggatt, T Ledergerber, L Arroyo, T Trejos. Transfer and persistence studies of inorganic and organic gunshot residues using synthetic skin membranes. Forensic Chemistry, 34, 2023, 100498, https://doi.org/10.1016/j.forc.2023.100498

  7. Mehltretter A, Prusinowski M, Arkes H, Flohr D, Neumann C, Ryland S, Sirk D, Trejos T. Interpretation and report writing in forensic comparisons of paint evidence: An interlaboratory exercise. Forensic Chemistry. 2023 Jun 16:100513. https://doi.org/10.1016/j.forc.2023.100513 (Cover page vol 35)

  8. LC Alexander, O Ovide, OC Duffett, AD Lewis, P Buzzini, J Curran, T Trejos. The Random Presence of Glass and Paint on the Clothing and Footwear of Members of the General Population: A US Baseline Survey at Various Seasons. J Foren Sci 2023, 00:1-17, DOI: 10.1111/1556-4029.15226 (selected by JFS journal for Media spotlight)

  9. AD Lewis, LC Alexander, O Ovide, OC Duffett, J Curran, P Buzzini, T Trejos. A study on the occurrence of glass and paint across various cities in the Uni‐ ted States—Part I: Background presence of glass in the general population, Forensic Chemistry, https://doi.org/10.1016/j.forc.2023.100497 (Cover Page Vol 34)

  10. LC Alexander, AD Lewis, OC Duffett, J Curran, P Buzzini, T Trejos. A Study on the Occurrence of Glass and Paint across Various Cities in the United States Part II: Background Presence of Paint in the General Population, Forensic Chemistry, 34, 10493, https://doi.org/10.1016/j.forc.2023.100493

  11. M Prusinowski, Z Andrews, C Neumann, T Trejos. Assessing significant factors that can influence physical fit examinations – Part I. Physical fits of torn and cut duct tapes. For. Sci. Int. 2023, 343, https://doi.org/10.1016/j.forsciint.2023.111567

  12. C Vander Pyl, W Feeney, L Arroyo, T Trejos, Assessment of the Limitations and Capabilities of GC-MS and LC-MS/MS for Trace Detection of Organic Gunshot Residues from Skin Specimens. Forensic Chemistry, 33, 2023, https://doi.org/10.1016/j.forc.2023.100471

  13. Prusinowski M, Brooks E, Neumann C, Trejos T. Forensic interlaboratory evaluations of a systematic method for examining, documenting, and interpreting duct tape physical fits. Forensic Chemistry. 2023 Jul 1;34:100487. https://doi.org/10.1016/j.forc.2023.100487

  14. O Ovide, R Corzo, T Trejos. The analysis of glass from portable electronic devices and glass accessories using µXRF for forensic investigations. Forensic Science International. 2023, 343, https://doi.org/10.1016/j.forsciint.2022.111550

  15. T Trejos. Forensic Glass Examinations—a Review Focused on Elemental Spectrochemical Analysis. WIREs Forensic Science, WILEY (Advanced reviewed invited contribution). 2022, e1476,. https://doi.org/10.1002/wfs2.1476

  16. J Almirall, T. Trejos. Interpol review of paint, tape, and glass evidence 2019-2022. Forensic Science International: Synergy, 6, 2022. https://doi.org/10.1016/j.fsisyn.2022.100306

  17. Sarah Szakas, Korina Menking-Hoggatt, Tatiana Trejos, Alexander Gundlach-Graham. Elemental Characterization of Leaded and Lead-Free Inorganic Primer Gunshot Residue Standards by spICP-TOFMS. Applied Spectroscopy. 2022. DOI: 10.1177/00037028221142624

  18. R Corzo, T Ernst, J Insana, C Martinez-Lopez, J Webb, E Haase, P Weis, T Trejos. Evaluation of the performance of modern X-ray fluorescence spectrometry systems for the forensic analysis of glass.  Forensic Chemistry , 2022. 31, 100447.

  19. K Dalzell, C Ott, T Trejos, L Arroyo. Comparison of portable and benchtop electrochemical instruments for detection of inorganic and organic gunshot residues in authentic shooter samples, J Forensic Sci, 2022,  https://doi.org/10.1111/1556-4029.15049

  20. K Menking-Hoggatt, C  Ott, C  Vander Pyl, K Dalzell, J Curran, L Arroyo,  T Trejos. Prevalence and Probabilistic Assessment of Organic and Inorganic Gunshot Residue and Background Profiles using LIBS, Electrochemistry, and SEM-EDS.  Forensic Chemistry, 2022, https://doi.org/10.1016/j.forc.2022.100429

  21. W Feeney, K Menking-Hoggatt, L Arroyo, J Curran, S Bell, T Trejos. Evaluation of organic and inorganic gunshot residues in various populations using LC-MS/MS, Forensic Chemistry, 2022, 27, https://doi.org/10.1016/j.forc.2021.100389.

  22. T Cooman, T Trejos, A Romero, L Arroyo. Implementing machine learning for the identification and classification of compounds and mixtures in portable Raman instruments. Chemical Physics Letters, 787, 2022, 139283, https://doi.org/10.1016/j.cplett.2021.139283

  23. C Martinez-Lopez, O Ovide, R Corzo, Z Andrews, J Almirall, T Trejos. Homogeneity assessment of the elemental composition of windshield glass by micro-XRF, LIBS, and LA-ICP-MS analysis. Forensic Chemistry, 27, 2022, 100384, https://doi.org/10.1016/j.forc.2021.100384

  24. K Lambert, S Montero, A Akmeemana, R Corzo, G Gordon, E Haase, P Jiang, O Ovide, K Prasch, K Redman, T Scholz, T Trejos, J Webb, P Weis, W Wiarda, S Wilczek, H Xie, P Zoon, J Almirall. An interlaboratory study to evaluate the forensic analysis and interpretation of glass evidence. Forensic Chemistry, 2022, 27, 100378, https://doi.org/10.1016/j/forc/2021.100378

  25. W Feeney, K Menking-Hoggatt, C Vander Pyl, C Ott, S Bell, L Arroyo, T Trejos. Detection of organic and inorganic gunshot residues from hands using complexing agents and LC-MS/MS. Analytical Methods. 2021, 13, 3024-3039,  https://doi.org/10.1039/D1AY00778E (Journal COVER PAGE and hot article)

  26. C Vander Pyl, C Martinez-Lopez, K Menking-Hoggatt, T Trejos. Analysis of primer gunshot residue particles by Laser Induced Breakdown Spectroscopy and Laser Ablation Inductively Coupled Plasma Mass Spectrometry. Analyst. 2021. https://doi.org/10.1039/D1AN00689D

  27. J Almirall, A Akmeemanaa, K Lambert, P Jiang, E Bakowska, R Corzo, C Martinez Lopez, E “Chip”Pollock, K. Prasch,  T Trejos, P Weis,  W Wiarda,  H Xie, P Zoon. Determination of seventeen major and trace elements in new float glass standards for use in forensic comparisons using laser ablation inductively coupled plasma mass spectrometry. Spectrochimica Acta B, 2021, 19, https://doi.org/10.1016/j.sab.2021.106119

  28. K Menking-Hoggatt, C Martinez, C Vander Pyl, E Heller, E Pollock, L Arroyo, and T. Trejos. Development of Tailor-Made Inorganic Gunshot Residue (IGSR) Microparticle Standards and Characterization with a Multi-technique Approach. Talanta. April 2021, 225, https://doi.org/10.1016/j.talanta.2020.121984

  29. R Corzo, T Hoffman, T Ernst, T Trejos, T Berman, S Coulson, P Weis, Al Stryjnik, H Dorn, E “Chip” Pollock, MS Workman, P Jones, B Nytes, T Scholz, H Xie, K Igowsky, R Nelson, K Gates, J Gonzalez, LM Voss, J Almirall, An interlaboratory study evaluating the interpretation of forensic glass evidence using refractive index measurements and elemental composition, Forensic Chemistry, 22, 2021, https://doi.org/10.1016/j.forc.2021.100307

  30. A Akmeemana, P Weis, R Corzo, D Ramos, P Zoon, T Trejos, T Ernst, C Pollock, E Bakowska, C Neumann, J Almirall, Interpretation of Chemical Data from Glass Analysis for Forensic Purposes, Journal of Chemometrics, Journal of Chemometrics. 2021; 35, e3267. https://doi.org/10.1002/cem.3267

  31. K Menking-Hoggatt, L Arroyo, J Curran and T Trejos. Novel LIBS method for chemical micro-mapping of inorganic gunshot residue collected from hand samples, Journal of Chemometrics, online Dec 2019, 2021;35: e3208, https://doi.org/10.1002/cem.3208 (top cited article 2021-2022)

  32. E Brooks, A Mehltretter, M Prusinowski, T Trejos. Optimization and Evaluation of Spectral Comparisons of Electrical Tape Backings by X-ray Fluorescence. Journal of Forensic Chemistry, 21, 2020.  https://doi.org/10.1016/j.forc.2020.100291

  33. J Almirall, T Trejos, K Lambert. Interpol review of glass and paint evidence 2016-2019, Forensic Science International: Synergy, 2020,  https://doi.org/10.1016/j.fsisyn.2020.01.010

  34. T Trejos, S Koch, A Mehltretter. Scientific Foundations and Current State of Trace Evidence—a Review, Journal of Forensic Chemistry, 18, May 2020. (Journal COVER PAGE). https://doi.org/10.1016/j.forc.2020.100223

  35. C Ott, K Dalzell, PJ Calderon, AL Alvarado-Gomez, T Trejos, L Arroyo. Evaluation of the Simultaneous Analysis of Organic and Organic Gunshot Residues within a Large Population Data Set Using Electrochemical Sensors, Journal of Forensic Sciences, 2020, https://doi.org/10.1111/1556-4029.14548

  36. E Brooks, M Prusinowski, S Gross, T Trejos. Forensic Physical Fits in the Trace Evidence Discipline: A Review, Forensic Science International, 313, 2020, https://doi.org/10.1016/j.forsciint.2020.110349

  37. C Vander Pyl, K Morris, L Arroyo, T Trejos. Assessing the utility of LIBS in the reconstruction of firearm related incidents, Journal of Forensic Chemistry, 19, June 2020, https://doi.org/10.1016/j.forc.2020.100251

  38. W Feeney, C Vander Pyl, S Bell, T. Trejos. Trends in Composition, Collection, Persistence, and Analysis of IGSR and OGSR: A Review. Journal of Forensic Chemistry, 19, June 2020, https://doi.org/10.1016/j.forc.2020.100250

  39. E Haase, L Arroyo, T Trejos. Classification of printing inks in pharmaceutical packages by Laser-Induced Breakdown Spectroscopy and Attenuated Total Reflectance-Fourier Transform Infrared Spectroscopy, Spectrochimica Acta B, 172, 2020. https://doi.org/10.1016/j.sab.2020.105963

  40. M Prusinowski, E Brooks, T Trejos. Development and validation of a systematic approach for the quantitative assessment of the quality of duct tape physical fits. Forensic Science International, 307, February 2020, https://doi.org/10.1016/j.forsciint.2019.110103

  41. RP Gorziza, CMB Carvalho, M González, LB Leal, T Korndörfer, RS Ortiz RS, T Trejos, Limberger RP. Blue and black ballpoint pen inks: a systematic review for ink characterization and dating analysis. Brazilian Journal of Forensic Sciences Medical Law and Bioethics. 8, 3, 2019, https://doi.org/10.17063/bjfs8(3)y2019113

  42. C Martinez-Lopez, T Trejos, S Coulson, J Goodpaster, K Igowsky, F Kuczelinis, A Mehltretter, E Pollock, U Simmross, R Weimer, P Weis, JR Almirall, Interlaboratory evaluations of the performance of elemental analytical methods for the forensic analysis and comparisons of electrical tapes, Forensic Chemistry, 12, 2019, 66-77. https://doi.org/10.1016/j.forc.2019.01.001

  43. C Vander Pyl, O Ovide, Ho M, Yuksel B, T Trejos. Spectrochemical Mapping Using Laser Induced Breakdown Spectroscopy as a More Objective Approach to Shooting Distance Determination, Spectrochimica Acta B, 2019, 152, 93-101. https://doi.org/10.1016/j.sab.2018.12.010

  44. B Yuksel, M Ho, O Ovide, C Vander Pyl, T Trejos. Infrared Imaging as a Complementary Aid in Estimating Muzzle-to-Target Shooting Distance: An Application on Dark, Patterned and Bloody Samples. T K J Foren Sci Leg Med, 16,2, 2019, 73-80. DOI: 10.5336/forensic.2019-64837

  45. M Prusinowski, A Mehltretter, C Martinez, J Almirall, T Trejos. Assessment of the utility of X- ray Fluorescence for the chemical characterization and comparison of black electrical tape backings. Forensic Chemistry, 2019, 13, 100146.  https://doi.org/10.1016/j.forc.2019.100146

  46. T Trejos, C Vander Pyl, K Menking-Hoggatt, AL Alvarado, L Arroyo. Fast Identification of Inorganic and Organic Gunshot Residues by LIBS and Electrochemical Methods, Forensic Chemistry, Elsevier, 2018, 8, 146-156. https://doi.org/10.1016/j.forc.2018.02.006

  47. K Rupert, M. Ho, T Trejos. Study of Transfer and Persistence of Glass in a Mock Kidnapping Case, Journal of the American Society of Trace Evidence Examiners, 2018, 8,1, 16-36.

  48. CJ Johnson, P. Martin, KA Roberts, T Trejos, R Corzo, JR Almirall, AM Safer. The Capability of Raman Microspectroscopy to Differentiate Printing Inks, Journal of Forensic Science , 2018, 1- 14. DOI: 10.111 1/155 6-4 029.13508

  49. C Martinez-Lopez, T Trejos, AH Mehltretter, JR Almirall. Elemental analysis and characterization of electrical tape backings by LA-ICP-MS, Forensic Chemistry, Elsevier, 2017,4, 96–107. https://doi.org/10.1016/j.forc.2017.03.003

  50. JR Almirall, T. Trejos. Applications of LA-ICP-MS to forensic science. Elements, Oct 2016, 12, 335-340. (Invited contribution, IF 4.5) https://doi.org/10.2113/gselements.12.5.335

  51. T Trejos, P Torrione, et al. A novel forensic tool for the characterization and comparison of printing ink evidence: development and evaluation of a searchable database using data fusion of spectrochemical methods, Journal of Forensic Sciences, 2016, 61, 3, 715-724 https://doi.org/10.1111/1556-4029.13109

Book Chapters:

  1. J Curran, T Hicks, T Trejos. Chapter 6: Interpretation of Glass Evidence. Desiderio, V.; Taylor, C. E.; Daeid, N. N., Handbook of Trace Evidence Analysis . Wiley. 2020. ISBN-13: 978-1118962114

  2. T Trejos, JR Almirall. “Forensic Characterization and Comparisons of Inks”. In Forensic Science Handbook . R. Saferstein and R. Hall eds, Chapter 7, 2019, 3rd edition, Vol 1.

  3. JR Almirall, T Trejos. “Analysis of Glass Evidence”. In Forensic Chemistry Fundamentals and Applications . J. Siegel ed. Willey Blackwell, John Wiley and Sons, 2016, ISBN 978-1-118-89772-0, Chapter 6, pp 228-272.

  4. T Trejos and JR Almirall, Laser Ablation Inductively Coupled Plasma Mass Spectrometry in Forensic Science in Wiley Encyclopedia of Analytical Chemistry (Forensic Analytical Chemistry Volume) G. Patonay, Ed. 2010, a9103, pp 1-26.

  5. J.R. Almirall and T. Trejos, Forensic applications of mass spectrometry in Encyclopedia of Mass Spectrometry , Vol. 5, Diane Beauchemin, Editor, 2010, pp 705-717.

  6. J.R. Almirall, Trejos, T; Hobbs, A; Perr, J; Furton, K.  Mass spectrometry in forensic science.  In: Advances in Mass Spectrometry , AE Ashcroft, G Brenton, JJ Mohaghan (Eds), Elsevier , 16, chapter 10, pp 167-187, 2004

Selected Presentations:

  1. April 2024. Liliana Barbosa, Thomas Ledergerber, Kourtney Dalzell, Luis Arroyo, and Tatiana Trejos. Characterization of Ammunition via LC-MS/MS Analysis of Smokeless Powders, Spent Cartridges, and Hand Residues. WVU 8th Annual Spring Undergraduate Research Symposium. Morgantown, WV (poster)
  2. April 2024. Claire Dolton, Lacey Leatherland, and Tatiana Trejos. Evaluating evidence integrity in the analysis of tape evidence when using latent print development and µXRF analysis. WVU 8th Annual Spring Undergraduate Research Symposium. Morgantown, WV (poster)
  3. April 2024. Addio Fiordigigli, Ian Balestrieri, Thomas Ledergerber, Kourtney Dalzell, Tatiana Trejos, and Luis Arroyo. Gas Chromatography Solutions for Monitoring Organic Gunshot Residues at Trace Levels. WVU 8th Annual Spring Undergraduate Research Symposium. Morgantown, WV (poster)
  4. April 2024. Brooke Weiss, Allison Carranza, Zachary Andrews, and Tatiana Trejos. Development of an Extensive Database for the Forensic Examination of Glass by µXRF Fluorescence. WVU 8th Annual Spring Undergraduate Research Symposium. Morgantown, WV (poster)
  5. February 2024. Thomas Ledergerber, Kourtney Dalzell, Matthew Staymates, Luis Arroyo, and Tatiana Trejos. Building Foundations for a more comprehensive interpretation of IGSR and OGSR evidence. Pittcon Scientific Conference, San Diego, CA (oral)
  6. February 2024. Kourtney A. Dalzell, Leah Thomas, Thomas Ledergerber, Tatiana Trejos, and Luis Arroyo. Can the incorporation of screening methods in gunshot residue workflows lead to more effective management of firearm-related cases? Pittcon Scientific Conference, San Diego, CA (poster)
  7. February 2024. Zachary Andrews, Lacey Leatherland, Troy Ernst, Ruthmara Corzo, Cedric Neumann, and Tatiana Trejos. Assessing Spectral Comparison Metrics for the Forensic Analysis of Glass and Electrical Tape. Pittcon Scientific Conference, San Diego, CA (poster)
  8. February 2024. Kourtney Dalzell, Leah Thomas, Madison Lindung, Tatiana Trejos, and Luis Arroyo. Evaluation of Mobile Technology for Detection of Inorganic and Organic Gunshot Residues in Firearm-Related Investigations. AAFS 76th Conference, Denver, CO (poster)
  9. February 2024. Troy Ernst, Zachary Andrews, Cedric Neumann,  Ruthmara Corzo, and Tatiana Trejos. Assessing the Reliability of Modern µXRF Technology for Expanded Impact on the Forensic Examination and Interpretation of Trace Materials: Glass Evidence. AAFS 76th Conference, Denver, CO (poster)
  10. February 2024. Lacey Leatherland, Ruthmara Corzo, Charlotte Vogler, Zachary Andrews, Cedric Neumann, Troy Ernst and Tatiana Trejos. Assessing the Reliability of Modern µXRF Technology for Expanded Impact on the Forensic Examination and Interpretation of Trace Materials: Tape Evidence. AAFS 76th Conference, Denver, CO (poster)
  11. February 2024. Luis Arroyo, Tatiana Trejos, Matt Staymates, Kourtney Dalzell, Thomas Ledergerber, Leah Thomas, and Madison Lindung. Comprehensive Assessment of Novel Reference Materials and Analytical Methods for the Analysis and Interpretation of Organic and Inorganic Gunshot Residues. NIJ Forensic Science R&D Symposium, AAFS 76th, Denver, CO (oral invited).
  12. February 2024. Tatiana Trejos, Zachary Andrews, Meghan Prusinowski, Cedric Neumann, Aldo Romero. Assessing the Strength of Trace Evidence Fracture Fits Through a Comprehensive, Systematic, and Quantifiable Approach. NIJ Forensic Science R&D Symposium, AAFS 76th, Denver, CO (oral invited).
  13. November 2023. Patrick Buzzini, Lauryn Alexander, Andra Lewis, James Curran, Tatiana Trejos. A survey of the background presence of glass and paint in the general population across various cities in the United States. 23rd Triennial Meeting of the International Association of Forensic Sciences. Sidney, Australia (oral)
  14. November 2023. Andria Mehltretter, Tatiana Trejos, Meghan Prusinowski. Past, present, and future states of interpretation and reporting of trace evidence comparisons in the United States. 23rd Triennial Meeting of the International Association of Forensic Sciences. Sidney, Australia (oral)
  15. November 2023. Thomas Ledergerber, Monica Joshi, Luis Arroyo, and Tatiana Trejos. Evaluation of Gas Chromatography-Triple Quadrupole Mass Spectrometry for the Identification of Organic Gunshot Residues from Known Shooters and Non-Shooters. 2023 Annual Eastern Analytical Symposium, New Jersey (invited speaker)
  16. November 2023. Tatiana Trejos, Luis Arroyo, Kourtney Dalzell, Thomas Ledergerber, Leah Thomas, and Madison Lindung. Development of Strategic Analytical Methods to Support the Modernization of Gunshot Residue Practice in Forensic Science.2023 Annual Eastern Analytical Symposium, New Jersey (invited speaker)
  17. October 2023. Tatiana Trejos, Luis Arroyo, Kourtney Dalzell, Leah Thomas, Madison Lindung, and Thomas Ledergerber. Streamlining Decision-making Processes at the Crime Scene and the Laboratory by Incorporating Fast Screening Tools into Current Gunshot Residue Workflows. FACSS SCIX Annual Meeting, Reno, NV (invited speaker)
  18. October 2023. Rutmara Corzo, Oriana Ovide, and Tatiana Trejos. Performance of µXRF and LIBS for the forensic analysis of small and irregular glass fragments. FACSS SCIX Annual Meeting, Reno, NV
  19. October 2023. Kourtney Dalzell, Leah Thomas, Thomas Ledergerber, Courtney Vander Pyl, Tatiana Trejos, Luis Arroyo, Jhanis Gonzalez, Chunyi Liu, Jong Yoo, and Richard E. Russo. Advancement of LIBS Mobile Technology for the Detection of Firearm Discharge Residue from Various Substrates and Assessment at Mock Crime Scenes. FACSS SCIX Annual Meeting, Reno, NV
  20. October 2023. Luis Arroyo, Tatiana Trejos, Kourtney Dalzell, Thomas Ledergerber, Leah Thomas. Strategies to streamline firearm-related investigations at the crime scene and the laboratory using modern screening tools for GSR detection. 2023 CFS Physical Sciences Symposium, Center of Forensic Science, Toronto, Canada. (invited speaker)
  21. October 2023. Tatiana Trejos, Luis Arroyo, Mat Staymates, Courtney Vander Pyl, Thomas Ledergerber, Kourtney Dalzell, and Madison Lindung. Lessons learned about the transfer and persistence of inorganic and organic gunshot residue. 2023 CFS Physical Sciences Symposium, Center of Forensic Science, Toronto, Canada. (invited speaker)
  22. October 2023. Tatiana Trejos, Zachary Andrews, Meghan Prusinowski, Pedram Tavazohi, Logan Lang, Aldo Romero, and Cedric Neumann. Assessment of modern methods for the quantitative comparison of physical fit examinations through large datasets and interlaboratory studies. 2023 CFS Physical Sciences Symposium, Center of Forensic Science, Toronto, Canada. (invited speaker)
  23. September 2023. Lacey Leatherland, Tatiana Trejos. Elemental analysis of electrical tapes-capabilities of modern µXRF technology. 2023 Graduate research symposium and poster session. NIJ-FTCoE National Forensic Science Week. (online oral poster)
  24. September 2023. Tatiana Trejos, Andria Mehltretter, and Meghan Prusinowski. Interpretation and report writing in forensic comparisons of paint evidence: results from an interlaboratory exercise. Webinar, NIST-OSAC.
  25. August 2023. Claire Dolton, Meghan Prusinowski, Zachary Andrews, Charlotte Vogler, Katelin Radonovich, Cedric Neumann, Tatiana Trejos. Efforts to strengthen the scientific foundation of physical fits of automotive plastics. Midwestern Association of Forensic Scientists (MAFS) 52nd Annual Meeting, Detroit, MI (poster)
  26. August 2023. Thomas Ledergerber, Kourtney Dalzell, Matt Staymates, Luis Arroyo, Tatiana Trejos. Gunshot residue visualization using laser sheet scattering, high speed videography, atmospheric particle samplers, and analytical techniques. Midwestern Association of Forensic Scientists (MAFS) 52nd Annual Meeting, Detroit, MI (oral presentation)
  27. August 2023. Lacey Leatherland, Ruthmara Corzo, Cedric Neumann, Tatiana Trejos. Evaluating and comparing the discrimination and informing power of µXRF and ATR-FTIR for the forensic analysis of tapes. Midwestern Association of Forensic Scientists (MAFS) 52nd Annual Meeting, Detroit, MI (oral presentation)
  28. August 2023. Zachary Andrews, Troy Ernst, Tatiana Trejos. Evaluation of comparison criteria for modern µXRF analysis of casework-like glass samples. Midwestern Association of Forensic Scientists (MAFS) 52nd Annual Meeting, Detroit, MI (oral presentation)
  29. July 2023. Alyson Niermeyer, Zachary Andrews, Tatiana Trejos. Modern Phone Screens as Forensic Evidence: Evaluation of Glass Refractive Index. 16th Annual Undergraduate Summer Symposium. Morgantown, WV.
  30. July 2023. Claire Dolton, Katie Radonvich, Meghan Prusinowski, Zachary Andrews, Pedram Tavadze, Tatiana Trejos. Development of quantitative metrics to assist in physical fit examinations of fractured automotive polymers. 16th Annual Undergraduate Summer Symposium. Morgantown, WV
  31. May 2023. Kourtney A. Dalzell, Courtney Vander Pyl, Leah Thomas, Colby E. Ott, Korina Menking-Hoggatt, Tatiana Trejos, and Luis E. Arroyo. Advancements in portable technology for gunshot residue detection using electrochemical and Laser-Induced Breakdown Spectroscopy (LIBS) devices. NIJ National Research Conference, Arlington, Virginia
  32. April 2023, Tatiana Trejos, Kourtney Dalzell, Thomas Ledergerber, Zach Andrews, Lacey Leatherland, Sharon Kalb. CSI Behind the Scenes: Discovering Clues through Science. WVU ERUREKA STEM Camp Forensic Workshop. Weston, WV
  33. April 2023. Madison Lindung, Tatiana Trejos, Luis Arroyo. West Virginia University Congressionally Directed Spending Programs visit to the US Capitol and meetings with members of US Congress. Research at WVU-FIS on Firearm-Related Investigations. (invited contribution).
  34. March 2023. Tatiana Trejos, Meghan Prusinowski, Zachary Andrews. Webinar and discussion forum on physical fits interlaboratory studies of duct tapes and textiles. Webinar.
  35. March 2023, Kourtney A. Dalzell, Courtney Vander Pyl, Tatiana Trejos, Luis E. Arroyo. Innovative sampling and screening methods for IGSR and OGSR analysis in firearm reconstruction investigations using electrochemistry and statistical analysis. Pittcon 2023. (Poster presentation).
  36. March 2023, Luis Arroyo, Tatiana Trejos, Matt Staymates, Korina Menking-Hoggatt, Colby Ott, Courtney Vander Pyl, Kourtney A. Dalzell, Thomas Ledergerber, and Bill Feeney. Pittcon 2023. NIJ Session. Advancements in the Analysis of Forensic Trace Evidence (G. Dutton session coordinator). Novel Tools for the Analysis of Organic and Inorganic Gunshot Residues: moving technology to the forefront. (Oral presentation)
  37. February 2023, Thomas Ledergerber, William Feeney, Edward Scisco, Luis Arroyo, Tatiana Trejos. Investigation of Authentic Organic Gunshot Residues by Direct Analysis in Real Time-Mass Spectrometry. AAFS meeting, Orlando, FL (poster presentation)
  38. February 2023, Zachary Andrews, Meghan Prusinowski, Tatiana Trejos. Assessment of a novel method for physical fit examinations using an extensive database of casework-like samples and interlaboratory studies. AAFS meeting, Orlando, FL (poster presentation)
  39. January 2023, Tatiana Trejos. Expanding the Capabilities of Gunshot Residues: Novel Sampling and Analytical Methods, virtual presentation to the NIST-OSAC GSR Subcommittee (invited oral presentation).
  40. January 2023, Madison Lindung, Kourtney Dalzell, Tatiana Trejos. Transfer and Persistence of Gunshot Residue on Clothing and Synthetic Skin Substrates by SEM-EDS, 20th Annual Undergraduate Research Day at the Capitol (poster presentation)
  41. January 2023, Leah Thomas, Kourtney Dalzell, Tatiana Trejos. Portable Screening Solution to Firearm-related Crimes using Laser Induced Breakdown Spectroscopy (LIBS), 20th Annual Undergraduate Research Day at the Capitol. (poster presentation)
  42. December 3rd, 2022. Madison Lindung, Korina Menking-Hoggatt, Courtney Vander Pyl, Kourtney Dalzell, and Tatiana Trejos. Transfer and Persistence of Gunshot Residue on Synthetic Skin by SEM-EDS. Fall Undergraduate Research Symposium, Morgantown, WV (Oral presentation)
  43. November 8th, 2022. Jose Almirall and Tatiana Trejos. INTERPOL International Forensic Science Managers Symposium. Tri-Annual Review of Glass, Paint, and Tape: Current State and Challenges Lyon, France. (Oral presentation-virtual, invited speaker)
  44. October 28th, 2022. Tatiana Trejos, Luis Arroyo, Korina Menking-Hoggatt, Courtney Vander Pyl, Kourtney Dalzell. Métodos novedosos para la identificación de partfculas orgánicas e inorgánicas de residuos de disparo XIII Congreso Internacional de Medicina Legal y Ciencias Forenses, Panama (Oral presentation, invited speaker)
  45. September 2022, Korina Menking-Hoggatt, Courtney Vander Pyl, Kourtney Dalzell, Colby E. Ott, Luis Arroyo, Tatiana Trejos. FTCoE National Forensic Week. Persistence, Prevalence, and Probabilistic Study of Inorganic and Organic Gunshot Residue in Shooter and Non-Shooter Populations (Poster-virtual, invited speaker)
  46. September 14th, 2022. T Trejos, A Quigley-McBride, M Prusinowski, Z Andrews. Workshop: Forensic Examinations of Physical Fits—Past, Present, and Future. MAFS 51st Annual Fall Meeting A Joint Meeting with ASTEE, Des Moines, Iowa. (workshop organizer and instructor, full day workshop)
  47. September 15th, 2022. Meghan Prusinowski, Zachary Andrews, Tatiana Trejos. Development of systematic and practical documentation templates for tape and textile physical fit comparisons. MAFS 51st Annual Fall Meeting A Joint Meeting with ASTEE. Des Moines, Iowa. (Oral presentation)
  48. September 16th, 2022. Zachary Andrews, Colton Diges, Tatiana Trejos. Evaluating the use of microfiber alignment in office paper and postage stamps to identify physical fits. MAFS 51st Annual Fall Meeting A Joint Meeting with ASTEE. Des Moines, Iowa. (Oral presentation)
  49. September 16th, 2022. Tatiana Trejos, Luis Arroyo, Korina Menking-Hoggatt, Courtney Vander Pyl, Kourtney Dalzell, Colby Ott, and Thomas Ledergerber. Development of innovative, reliable, and fast screening methods for the detection of organic and inorganic gunshot residues. MAFS 51st Annual Fall Meeting A Joint Meeting with ASTEE Des Moines, Iowa. (Oral presentation)
  50. September 17th, 2022. Lauryn Alexander, Oriana Ovide, Olivia Duffett, Andra Lewis-Krick, Patrick Buzzini, Tatiana Trejos. Evaluation of Glass and Paint Traces on Clothing and Footwear of the General Public in Various U.S. Regions and Seasons. MAFS 51st Annual Fall Meeting A Joint Meeting with ASTEE. Des Moines, Iowa. (Oral presentation)
  51. July 28th, 2022. Madison Lindung, Leah Thomas, Korina Menking-Hoggatt, Courtney Vander Pyl, and Tatiana Trejos. Portable versus Benchtop LIBS Comparison for Screening of Gunshot Residue. WVU Summer Undergraduate Symposium, Morgantown, WV (Poster, 2nd place award)
  52. June 1st 2022. Meghan Prusinowski, Zachary Andrews, Cedric Neumann, Tatiana Trejos. Assessing significant factors that can influence physical fit examinations of tape and textiles. European Academy of Forensic Sciences (EAFS) conference, Stockholm, Sweden (Poster)
  53. May 31st, 2022. Tatiana Trejos and Luis Arroyo. Analysis and Interpretation of Organic and Inorganic Gunshot Residues: Lessons Learned from a Large Population Study. European Academy of Forensic Sciences (EAFS) conference, Stockholm, Sweden (Oral presentation, invited keynote speaker)
  54. April 2022, Tatiana Trejos, Meghan Prusinowski, Korina Menking-Hoggatt. CSI Behind the Scenes: Discovering Clues through Science. STEM Camp Forensic Workshop.
  55. February 2022. Kourtney Dalzell, Courtney Vander Pyl, MS, Tatiana Trejos. and Luis Arroyo, Combining novel sampling techniques and electrochemical detection in GSR analysis for bullet hole identification and distance determination. 20, Seattle, WA Poster Presentation).
  56. February 2022. Courtney Vander Pyl, MS, Korina Menking-Hoggatt, Tatiana Trejos. Rapid Spectrochemical Mapping Techniques for Enhanced Detection and Visualization of Gunshot Residue Patterns. AAFS Conference, Seattle, WA Poster Presentation).
  57. February 2022. William Feeney, Korina Menking-Hoggatt, Luis Arroyo, James Curran, Suzanne Bell, Tatiana Trejos. An Evaluation of Organic and Inorganic Gunshot Residues in Various Populations Using Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS). AAFS Conference, Seattle, WA. (Oral presentation)
  58. February 2022 Korina Menking-Hoggatt, Colby E. Ott, Courtney Vander Pyl, Kourtney Dalzell, James Curran, Luis Arroyo, Tatiana Trejos. Probabilistic Interpretation of a Large Population Study of Gunshot Residue and Background Profiles using LIBS, Electrochemistry, and SEM-EDS, Seattle, WA. (Oral presentation)
  59. February 2022. Meghan Prusinowski, Evie Nguyen, Tatiana Trejos. Validation of a Systematic Method for Duct Tape Physical Fits Through Inter-Laboratory Studies. 2022 AAFS Conference, Seattle, WA. (Poster, Virtual)
  60. February 2022. Zachary Andrews, Colton Diges, Tatiana Trejos. Feature Occurrence and Error Rates in Textile Physical Fit Comparisons. 2022 AAFS Conference, Seattle, WA. (Poster)
  61. February 2022, Lauryn C. Alexander, Oriana Ovide, Olivia Duffett, Andra Lewis-Krick, Dr. Patrick Buzzini, Dr. Tatiana Trejos, A Comparative Study on the Background Presence of Glass and Paint in Various Populations and Seasons in the United States, American Academy of Forensic Sciences Annual Conference, Seattle, WA. (Oral Presentation).
  62. December 2021, Jessica Friedel, Korina Menking-Hoggatt, Tatiana Trejos. A Study of Gunshot Residue Prevalence in the General Population of Morgantown West Virginia, WVU Fall Undergraduate Symposium (Oral Presentation)
  63. October 2021. Meghan Prusinowski, Zachary Andrews, Tatiana Trejos. Development of systematic methods for the physical edge comparison of trace materials. 2021 Brazil Winter 3rd School of Forensic Sciences (Virtual, Oral Presentation)
  64. October 2021, Lauryn C Alexander, Oriana Ovide, Olivia Duffett, Tatiana Trejos. The Background and Relevance of Microscopic Traces of Glass Evidence in Forensic Investigations, 2021 Brazilian Winter School Conference, (virtual oral presentation)
  65. October 2021. Courtney Vander Pyl, Kourtney Dalzell, Tatiana Trejos, and Luis Arroyo. Emerging Analytical Techniques for the Reconstruction of Firearm-Related Incidents. Brazil 3rd School of Forensic Science (Virtual, Oral Presentation).
  66. October 2021, Lauryn C Alexander, Oriana Ovide, Olivia Duffett, Tatiana Trejo. Why does it matter to understand how common it is to find paint and glass microparticles in the regular population- A forensic perspective, 2021 9th Annual Black Doctoral Network Conference (Poster & Oral Presentation)
  67. October 2021. Korina Menking-Hoggatt; William Feeney, Tatiana Trejos, Luis Arroyo. Study of various types of Gunshot Residue and Background Populations using LIBS, Electrochemistry, SEM-EDS, LC/MS/MS and probabilistic Interpretation. Brazilian Winter School Program (Virtual, Oral Presentation).
  68. September 23, 2021, Korina Menking-Hoggatt, Edward “Chip” Pollock, Emily Heller, Courtney Vander Pyl, Claudia Martinez, Tatiana Trejos. Inorganic Gunshot Residue (IGSR) Micro-particle Standard with Application to Method Development and Understanding Modern Ammunition. Mid-Atlantic Association of Forensic Scientist and ASTEE joint meeting (oral, MAAFS Annual Scholarship Winner)
  69. September 23, 2021, Lauryn Alexander, Oriana Ovide, Olivia Duffett. How common is it to find glass and paint residues in a member of the general U.S. population? A preliminary study. Mid-Atlantic Association of Forensic Scientist and ASTEE joint meeting (oral)
  70. September 23, 2021. Courtney Vander Pyl, Korina Menking-Hoggatt, Tatiana Trejos. Rapid Analytical Screening Methods for the Investigation of Firearm Related Crimes. Mid-Atlantic Association of Forensic Scientist and ASTEE joint meeting (oral)
  71. July 30th, 2021. Tatiana Trejos and Andria Mehltretter. Lessons Learned from Paint and Tape Interlaboratory Exercises: Do systematic approaches lead to examiner consistency? Current Trends in Forensic Trace Analysis 2021 Online Forensic Symposium. (Oral, invited)
  72. July 29th, 2021. Colton Diges, Zachary Andrews, Meghan Prusinowski. Microfiber Alignment in Stamp Edges for Physical Fit. 13th Annual summer undergraduate research symposium, Morgantown, WV https://www.youtube.com/watch?v=tdt-TiiNtXM
  73. July 29th, 2021. Olivia Duffet, Lauryn Alexander, Oriana Ovide, Tatiana Trejos. Survey of Glass and Paint in the General Population to Assess their Evidential Value. 13th Annual summer undergraduate research symposium, Morgantown, WV https://www.youtube.com/watch?v=0aDxkbAueco
  74. July 29th, 2021. Declan Revenew, Courtney Vander Pyl, Bill Feeney, Tatiana Trejos. Evaluating GC-MS and LC-MS/MS Efficacy for Characterization of a Developed Organic Gunshot Residue Standard. 13th Annual summer undergraduate research symposium, Morgantown, WV https://www.youtube.com/watch?v=1yszuB1nH60
  75. July 28th, 2021. Jessica Friedel, Korina Menking-Hoggatt, and Tatiana Trejos. Prevalence of Particles Characteristic and Consistent with GSR Found in A Background Population Study. Current Trends in Forensic Trace Analysis 2021 Online Forensic Symposium. (poster)
  76. July 28th, 2021. Courtney Vander Pyl, Claudia Martinez-Lopez, Korina Menking-Hoggatt, Tatiana Trejos. Rapid Laser-Based Methods for the Detection of Modern Gunshot Residues. Current Trends in Forensic Trace Analysis 2021 Online Forensic Symposium. (Poster, BEST POSTER ELSERVIER FORENSIC CHEMISTRY AWARD)
  77. July 28th, 2021. Bill Feeney, Suzanne Bell, Tatiana Trejos. Exploring the probabilistic interpretation of gunshot residue in various populations using LC-MS/MS. Current Trends in Forensic Trace Analysis 2021 Online Forensic Symposium. (poster)
  78. July 28th, 2021. Lauryn Alexander, Oriana Ovide, Olivia Duffet, Tatiana Trejos A Study of Frequency of Occurrence of Glass and Paint in the U.S. Population: Preliminary Findings. Current Trends in Forensic Trace Analysis 2021 Online Forensic Symposium. (poster)
  79. July 28th, 2021. Oriana Ovide, Ruthmara Corzo, Tatiana Trejos. Assessing the Variability Within Small Vehicular Glass Fragments Using µ-XRF. Current Trends in Forensic Trace Analysis 2021 Online Forensic Symposium. (poster)
  80. July 28th, 2021. Zachary Andrews, Colton Diges, Meghan Prusinowski, Tatiana Trejos. Assessing the Value of Microfiber Alignment Between Stamp Edges for Physical Fit Comparisons. Current Trends in Forensic Trace Analysis 2021 Online Forensic Symposium. (poster)
  81. June 2nd, 2021. Tatiana Trejos, Meghan Prusinowsli, Zachary Andrews. Forensic Examination of Duct Tape Physical Fits: Interlaboratory Results, NIST-OSAC Trace Subcommittee (oral)
  82. April 2021, Tatiana Trejos. Perfiles químicos como pistas en escenas del crimen. 30th Anniversary of Costa Rican Scientific Highschool Systems (invited oral)
  83. March 2021, Tatiana Trejos. Experiences from a Forensic Scientist. A.O.E. Junior Academy for Young Women in STEM (invited oral)
  84. March 2021, Luis Arroyo, Tatiana Trejos, Korina Menking Hoggatt, Colby Ott, Courtney Vander Pyl, Kourtney Dalzell, Bill Feeney. Detection of gunshot residues from leaded and non-leaded ammunition by electrochemical sensors and LIBS, PITTCON 2021 (invited speaker)
  85. March 2021, Tatiana Trejos, Luis Arroyo, Korina Menking Hoggatt and Courtney Vander Pyl. LIBS as an emerging method for the detection of firearm discharge residues, NIJ (National Institute of Justice) -Emerging Analytical Methods for Chemical and Biological Forensic Evidence Session, PITTCON 2021 (invited speaker)
  86. January 2021, Bill Feeney, Tatiana Trejos. Detection of OGSR and IGSR from the same collection stub using complexing agents and LC/MS/MS, 4th event Global Lecture Series, Crossing Forensic Borders (invited speaker)
  87. January 2021, Korina Menking-Hoggatt, C. Ott, Tatiana Trejos, Luis Arroyo. Novel rapid detection of inorganic and organic gunshot residues using LIBS and electrochemistry: a population study, 4th event Global Lecture Series, Crossing Forensic Borders. (Invited speaker)
  88. February 2021, Courtney Vander Pyl, Korina Menking-Hoggatt, Claudia Martinez, Tatiana Trejos. Application of Laser-Based Methods for the Analysis of Gunshot Residue Originating from Modern Ammunition. AAFS 2021
  89. February 2021, Kourtney A. Dalzell, Korina Menking-Hoggatt, Colby E. Ott, Tatiana Trejos, and Luis Arroyo. Detection of Lead-Free Inorganic and Organic Gunshot Residue Using LIBS, Electrochemistry, and Machine Learning. AAFS 2021
  90. February 2021, Meghan Prusinowski, Zachary Andrews, Evie Nguyen, Tatiana Trejos. Development of Systematic Approaches for Physical Fit Comparisons of Trace Materials. Presented at Virtual AAFS Conference (E-Poster)
  91. December 2020. Tatiana Trejos and Luis Arroyo. Strengthening the Technical-Scientific and Quality Control Framework of the Judicial System in Costa Rica: from Crime Scene to the Expert Opinion in Courtroom. Department of State, Bureau of International Narcotics and Law Enforcement Affairs (INL), Costa Rica US Embassy, San Jose CR (oral)
  92. December 2020. Tatiana Trejos, Andria Mehltretter, , Meghan Prusinowski. An Interlaboratory Study on Interpretation and Report Writing in Forensic Comparison of Paint Trace Materials. NIST-OSAC Meeting (virtual, invited speaker)
  93. December 2020. William Feeney. American Society of Crime Laboratory Directors (ASCLD) Forensic Research Committee “Lightning Talks” series: Emerging Techniques and Applications for Gunshot Residues (webinar, invited speaker).
  94. November 2020. Korina Menking-Hoggatt, Luis Arroyo, and Tatiana Trejos. Feasibility Study of Rapid Emerging Methods for the Analysis of Inorganic and Organic Gunshot Residues. 7º National Meeting of Forensic Chemistry / 4º Meeting of the Brazilian Society of Forensic Sciences (ENQFor/SBCF) online Joint Congress. (Virtual, oral, invited speaker)
  95. October 2020. Tatiana Trejos and Ruthmara Corzo. An Effective Framework for Interlaboratory Studies: Lessons Learned for Refractive Index and u-XRF Spectral Data in Glass Analysis. ASTM International Workshop on Interlaboratory Studies and Collaborative Research in the Forensic Sciences (virtual, oral invited speaker)
  96. October 2020. Tatiana Trejos, Luis Arroyo, Colby Ott, Courtney Vander Pyl, Korina Menking Hoggatt and Kourtney Dalzell. Investigative leads using LIBS and orthogonal methods in crime laboratories and in the field, FACSS SCIX 2020, virtual conference.
  97. October 2020. Meghan Prusinowski, Zachary Andrews, Evie Brooks, Tatiana Trejos. Development and Validation of Systematic Methods for Physical Fit Examinations. [Virtual Oral Presentation]. Joint ASTEE and Northeastern Association of Forensic Scientists 46th Annual Conference Virtual: https://whova.com/portal/webapp/naofs_202010/.
  98. September 2020. Korina Menking-Hoggatt, Eduard Pollock, Emily Heller, Courtney Vander Pyl, Claudia Martinez, Tatiana Trejos. Inorganic Gunshot Residues (IGSR) Microparticles Standard with Application to Method Development and Understanding Modern Ammunition. MAAFS Annual Meeting (Oral presentation, virtual, recipient of 2020 MAAFS Scholarship Award)
  99. July 2020. Tatiana Trejos, Cedric Neumann. Advances in physical fit and spectral comparisons of tapes. 2020 Online Symposium: Current Trends in Forensic Trace Analysis (oral presentation, presenter and Symposium Program Chair)
  100. July 2020. Luis Arroyo, Tatiana Trejos, and Korina Menking-Hoggatt. Development of a Versatile IGSR Microparticle Standard. 2020 Online Symposium: Current Trends in Forensic Trace Analysis (oral presentation, presenter and Symposium Program Chair)
  101. July 2020. Courtney Vander Pyl, Oriana Ovide, Colby Ott, Luis Arroyo and Tatiana Trejos. Quick Spectrochemical Methods for Detecting Gunshot Residues on Crime Scene Samples. Current Trends in Trace Analysis: 2020 Online Forensic Symposium Series (virtual, poster).
  102. July 2020. Claudia Martinez-Lopez, Oriana Ovide, Ruthmara Corzo, Zachary Andrews, Lauryn Alexander, Tatiana Trejos. Assessing the Elemental Homogeneity of Single Source Vehicle Glass by u-XRF, LIBS, and LA-ICP-MS. Current Trends in Forensic Trace Analysis: 2020 Online Symposium (virtual poster)
  103. July 2020. Evie Brooks, Zachary Andrews, Meghan Prusinowski, Tatiana Trejos. Development of a Systematic Method for Textile Physical Fit Comparisons. Current Trends in Forensic Trace Analysis: 2020 Online Symposium (virtual poster)
  104. July 2020. Korina Menking-Hoggatt, Luis Arroyo, Colby Ott, and Tatiana Trejos. Characterizing Inorganic and Organic Gunshot Residue by Laser Induced Breakdown Spectroscopy and Electrochemistry. Current Trends in Forensic Trace Analysis online forensic symposium. (Poster online presentation)
  105. May 2020. Courtney Vander Pyl, Korina Menking-Hoggatt, Claudia Martinez, Tatiana Trejos. Fast Spectrochemical Methods and Micro-Particle Standards to Facilitate Transfer and Persistence Studies of Inorganic and Organic Gunshot Residues. First Online Forensic Graduate Symposium, Morgantown, WV (poster, symposium organizer) (AWARD for “Best Research e-Poster Presentation-First Place)
  106. May 2020. Meghan Prusinowski, Evie K. Brooks, Pedram Tavadze, Aldo Romero, Tatiana Trejos. Validation of a Quantitative Method for Assessing Physical Fits of Trace Materials through Inter-Laboratory Studies and Computational Algorithms. First Online Forensic Graduate Symposium, Morgantown, WV (poster, symposium organizer)
  107. May 2020. Korina Menking-Hoggatt, Tatiana Trejos. Characterization of Modern Inorganic Gunshot Residue Micro-Particles for Enhancement of Forensic Analysis. First Online Forensic Graduate Symposium, Morgantown, WV (oral, symposium organizer)
  108. May 2020. Colby E. Ott, Pedro J. Calderón-Arce, Kourtney A. Dalzell, Hugo Cunha-Silva, Ana L. Alvarado-Gámez, M. Julia Arcos-Martínez, Tatiana Trejos, Luis E. Arroyo. Electrochemistry: A Powerful Analytical Technique for the Analysis of Forensic Evidence. First Online Forensic Graduate Symposium, Morgantown, WV (poster, symposium organizer)
  109. May 2020. Evie Brooks, Meghan Prusinowski, Andria Mehltretter, Tatiana Trejos. Evaluation of Spectral Comparison and Contrast Methods for the Interpretation of X-ray Fluorescence Spectra of Electrical Tape Backings. First Online Forensic Graduate Symposium, Morgantown, WV (poster, symposium organizer)
  110. May 2020. Emily Haase, Luis Arroyo, Tatiana Trejos. Evaluation of the Chemical Profile of Counterfeit Pharmaceutical Packaging Using LIBS and ATR-FTIR. First Online Forensic Graduate Symposium, Morgantown, WV (poster, symposium organizer)
  111. May 2020. Lauryn Alexander, Zachary Andrews, Oriana Ovide, Claudia Martinez-Lopez, Tatiana Trejos. Evaluation of the Performance of Laser Induced Breakdown Spectroscopy Elemental Profiles for the Forensic Comparison of Glass. First Online Forensic Graduate Symposium, Morgantown, WV (poster, symposium organizer)
  112. April 2020. Emily Heller, Korina Menking-Hoggatt, Claudia Martinez-Lopez, and Tatiana Trejos. Analysis of Inorganic GSR Microparticles using Laser Induced Breakdown Spectroscopy (LIBS), Annual Undergraduate Symposium, Morgantown, WV (e-video poster)
  113. April 2020. Zachary Andrews, Oriana Ovide, , Claudia Martinez-Lopez, PhD, Ruthmara Corzo, PhD Lauryn Alexander, BS, Tatiana Trejos, PhD. Forensic Investigations of Vehicle-Related Crimes: Is it Elemental? Annual Undergraduate Symposium, Morgantown, WV (e-video poster)
  114. March 2020. Tatiana Trejos, Evie Brooks, Meghan Prusinowski. Interlaboratory Study on Physical Fits of Duct Tapes: Lessons Learned and Next Steps. NIST-OSAC meeting, Norman, OK (oral)
  115. March 2020. Ruthmara Corzo and Tatiana Trejos. Elemental analysis of glass using micro- XRF with modern detector systems: Interlaboratory Results. NIST-OSAC, Norman, OK (oral)
  116. March 2020. Korina Menking-Hoggatt, Emily Heller, Edward M. Pollock, Claudia Martinez, Tatiana Trejos. Development and Characterization of Inorganic Gunshot Residue (IGSR) Standard Micro-particles to Enhance Understanding of Modern Ammunition. The NIJ Forensic Science Symposium at Pittcon, Chicago, IL (poster)
  117. February 2020, Oriana Ovide, Ruthmara Corzo, Tatiana Trejos, Analysis of Modern Glass for Forensic Comparisons Using micro-XRF, Louis Stokes Alliance for Minority Participation (LSAMP) KY-WV 13th Annual Research Symposium, Poster
  118. February 2020. Tatiana Trejos and Luis Arroyo. Rapid Detection of Inorganic and Organic Firearm Discharge Residues by Laser-Induced Breakdown Spectroscopy (LIBS) and Electrochemical Sensors. 2020 National Institute of Justice Forensic Science Research and Development Symposium, Anaheim, CA (oral, invited)
  119. February 2020. Korina Menking-Hoggatt, Colby E. Ott, Courtney H. Vander Pyl, Luis Arroyo, James Curran, Tatiana Trejos. The Power of Statistics and Machine Learning Applied to Orthogonal Rapid Methods for the Identification of Inorganic Gunshot Residue (IGSR) and Organic Gunshot Residue (OGSR) Markers. 72nd AAFS Annual Scientific Meeting, Anaheim, CA (oral)
  120. February 2020. Korina Menking-Hoggatt, Edward M. Pollock, Tatiana Trejos. A Novel Approach for the Collection and Characterization of Inorganic Gunshot Residue (IGSR) Standards, 72nd AAFS Annual Scientific Meeting, Anaheim, CA (poster)
  121. February 2020. Colby E. Ott, Pedro Calderón-Arce, Korina Menking-Hoggatt, Courtney H. Vander Pyl, Ana L. Alvarado-Gámez, Tatiana Trejos, Luis E. Arroyo. An Analysis of Organic and Inorganic Gunshot Residues (OGSR and IGSR) Via Electrochemical Methods with Screen- Printed Carbon Electrodes and Nanoparticle Modifications, 72nd AAFS Annual Scientific Meeting, Anaheim, CA (poster)
  122. February 2020. Courtney H. Vander Pyl, Oriana Ovide, Colby E. Ott, Luis E. Arroyo, Tatiana Trejos. A Chemical Analysis of Gunshot Residues (GSRs) for Investigative Leads and Reconstruction of Firearm- Related Incidents, 72nd AAFS Annual Scientific Meeting, Anaheim, CA (poster)
  123. February 2020. William Feeney, Suzanne Bell, Luis E. Arroyo, Tatiana Trejos. The Characterization and Detection of Organic and Inorganic Firearm Discharge Residue (FDR) Using High-Performance Liquid Chromatography-Triple Quadrupole (HPLC-QQQ) and Host- Guest Chemistry, 72nd AAFS Annual Scientific Meeting, Anaheim, CA (oral)
  124. February 2020. Meghan Prusinowski, Evie K. Brooks, Pedram Tavadze, Aldo Romero, Tatiana Trejos. Assessing the Value of a Physical End Match in Trace Evidence: A Comparison of Human-Based and Computational-Based Approaches, 72nd AAFS Annual Scientific Meeting, Anaheim, CA (oral)
  125. February 2020. Evie K. Brooks, Andria Mehltretter, Tatiana Trejos. Parameter Optimization and Validation for Qualitative Elemental Analysis of Electrical Tape Backings by X-Ray Fluorescence (XRF), 72nd AAFS Annual Scientific Meeting, Anaheim, CA (oral)
  126. February 2020. Oriana Ovide, Zachary B. Andrews, Ruthmara Corzo, Tatiana Trejos. An Assessment of Elemental Homogeneity in Glass Using Micro-X-Ray Fluorescence Spectroscopy (μ-XRF) and Laser-Induced Breakdown Spectroscopy (LIBS) , 72nd AAFS Annual Scientific Meeting, Anaheim, CA (oral)
  127. February 2020. Emily A. Haase, Mandy Ho, Tatiana Trejos, Luis E. Arroyo. A Fast Examination of Counterfeit Pharmaceutical Packaging Through Laser-Induced Breakdown Spectroscopy (LIBS) and Attenuated Total Reflectance/Fourier Transform Infrared (ATR/FTIR) Spectroscopy, 72nd AAFS Annual Scientific Meeting, Anaheim, CA (oral)
  128. November 2019. Tatiana Trejos, Luis Arroyo and Suzanne Bell. Rapid Identification of Organic and Inorganic Gunshot Residues. Webinar Sponsored by NIJ and organized by FTCOE and RTI international, November 20th, 2019. (Invited speakers, webinar live streamed and available on demand https://forensiccoe.org/webinar/rapid-and-effective-identification-of- organic-and-inorganic-gunshot-residues/)
  129. October 2019. Tri-Annual Review of Glass and Paint: Current State and Challenges. INTERPOL International Forensic Science Managers Symposium, Lyon, France (invited speaker)
  130. October 2019. Using LIBS for Elemental Signature Discovery in Forensic Applications. Tatiana Trejos, Luis Arroyo, Emily Haase, Courtney Vander Pyl, Korina Menking-Hoggatt. SCIX Annual meeting, Palm Springs, CA (invited speaker)
  131. October 2019. Korina Menking-Hoggatt, Colby Ott, Luis Arroyo, and Tatiana Trejos. Characterizing Inorganic and Organic Gunshot Residue by Laser Induced Breakdown Spectroscopy and Electrochemistry, SCIX conference, Palm Springs, CA (poster)
  132. October 2019. Courtney Vander Pyl, Oriana Ovide, and Tatiana Trejos. Application of Laser Induced Breakdown Spectroscopy in the Reconstruction of Firearm Related Incidents, SciX conference, Palm Springs, CA (poster)
  133. October 2019. E Haase, M Ho, T Trejos, and L Arroyo. Assessing the Discrimination of Pharmaceutical Packaging Ink Through LIBS and ATR-FTIR. SciX conference, Palm Springs, CA (poster)
  134. July 2019. M Prusinowski, E Brooks, T Trejos. Developing a Systematic Method for the Comparison of Duct Tape Edges. NIST-OSAC meeting, Orlando, FL (oral presentation, invited)
  135. May 2019. Tatiana Trejos. Trace Evidence: Then, Now and Moving Forward. MAAFS meeting, Morgantown WV.
  136. May 2019. Emily Haase, Mandy Ho, Luis Arroyo, Tatiana Trejos. Spectroscopic Analytical Tools for the Discrimination of Blank Ink on Pharmaceutical Packaging: Tackling Counterfeits. MAAFS meeting, Morgantown WV.
  137. May 2019. Courtney Vander-Pyl, Oriana Ovide, Tatiana Trejos. A Novel Approach for Increased Objectivity in Detecting Gunshot Residues Around Bullet Orifices, MAAFS meeting, Morgantown WV.
  138. May 2019. Korina Menking-Hoggatt, Luis Arroyo, Tatiana Trejos. Modern Fast Screening of Inorganic and Organic Gunshot Residue (GSR) by Laser-Induced Breakdown Spectroscopy (LIBS) and Electrochemistry (EC), MAAFS meeting, Morgantown WV.
  139. May 2019. M Prusinowski, E Brooks, T Trejos. Putting the Pieces Together: Developing and Applying a Systematic Method for the Comparison of Duct Tape Edges, MAAFS meeting, Morgantown WV
  140. April 2019. Katrina Rupert, Paige Schmitt, Megan Bradley, and Tatiana Trejos. Transfer and persistence of vehicle glass: Experimental studies utilizing mock crime scenes. CBDIAI meeting, Richmond, VA (poster presentation, first prize award)
  141. April 2019. Meghan Bradley, Paige Schmitt, Tatiana Trejos. Mock Vandalism: a Study of the Transfer and Persistence of Glass, Paint, and Plastic. Annual Undergraduate Symposium, Morgantown, WV.
  142. February 2019. Luis Arroyo, Korina Menking-Hoggatt and Tatiana Trejos. The Fusion of Electrochemical and Spectrochemical Data for the Detection of Organic and Inorganic Gunshot Residues (GSR), AAFS meeting, Baltimore
  143. February 2019. Courtney Vander Pyl, Oriana Ovide, Bayram Yuksel and Tatiana Trejos. Increased objectivity of shooting distance determinations by Spectrochemical Mapping, AAFS meeting, Baltimore
  144. February 2019. Korina Menking-Hoggatt and Tatiana Trejos. Laser-Induced Breakdown Spectroscopy as a Rapid Detection Technique for Gunshot Residue, AAFS meeting, Baltimore
  145. February 2019. Meghan Prusinowski and Tatiana Trejos. The forensic evaluation of cut and torn duct tape fractures: a validation study to quantify the quality of a physical match, AAFS meeting, Baltimore
  146. February 2019. Meghan Prusinowski and Tatiana Trejos. Characterization and Comparison of Electrical Tape Backings by X-Ray Florescence, AAFS meeting, Baltimore
  147. December 2018. Paige Schmitt, Chelsea Thomson, Katrina Rupert, Megan Bradley, Luis Arroyo and Tatiana Trejos. Transfer and Persistence of Glass and Paint in Vehicle Collisions. RAP undergraduate poster session, Morgantown WV (undergraduate RAP program)
  148. October 2018. Tatiana Trejos, Korina Menking-Hoggatt, Luis Arroyo. Chemical analysis and statistical interpretation of gunshot residues using LIBS and electrochemical sensors. SCIX meeting, Atlanta. (Invited speaker)
  149. September 2018. Korina Menking-Hoggatt, Luis Arroyo and Tatiana Trejos. Identification of Organic and Inorganic Gunshot Residues by Electrochemical and Spectrochemical Methods, Sacramento County District Attorney Crime Lab, Technical Scientific Visit, Sacramento, CA.
  150. September 2018. Korina Menking-Hoggatt and Tatiana Trejos. Characterization of Modern Ammunition and Background Profiles: A Novel Approach and Probabilistic Interpretation of Inorganic Gunshot Residue, Sacramento County District Attorney Crime Lab, Technical Scientific Visit, Sacramento, CA.
  151. September 2018. Korina Menking-Hoggatt, Courtney Vander Pyl and Tatiana Trejos. LIBS Applications for Firearm Distance Determinations, Sacramento County District Attorney Crime Lab, Technical Scientific Visit, Sacramento, CA.
  152. September 2018. Korina Menking-Hoggatt and Tatiana Trejos. Return on Investment for Rapid LIBS Analysis, Sacramento County District Attorney Crime Lab, Technical Scientific Visit, Sacramento, CA.
  153. September 2018. Tatiana Trejos, Nathan Carey, Katrina Rupert, Chelsea Thomson, and David Green. Transfer and Persistence of Glass: Lessons Learned from Mock Crime Scenes, European Network of Forensic Science Institutes (ENFSI), 24th EPG Meeting, Pontoise, France (invited speaker)
  154. September 2018. Tatiana Trejos. OSAC Trace Materials Subcommittee Update. European Network of Forensic Science Institutes (ENFSI), 24th EPG Meeting, Pontoise, France (invited speaker)
  155. July 2018. Tatiana Trejos. Streamlined Elemental Analysis Applications of LIBS to Forensic Evidence, Webinar sponsored by Applied Spectra (invited keynote speaker)
  156. July 2018. Oriana Ovide, Courtney Vander Pyl, Bayram Yuksel, Korina Menking-Hoggatt and Tatiana Trejos. Distance Determination Using Firearm Discharge Residues: Challenges of Color Tests and Benefits of LIBS, Annual Undergraduate Research Symposium, Morgantown, WV (undergraduate SURE program)
  157. July 2018. Tatiana Trejos. Role of Data Collection in Forensic Investigations: Questioned Documents and Paints. First Ecola de Inverno de Ciencias Forenses. Porto Alegre, Brazil (invited speaker)
  158. July 2018. Tatiana Trejos. Forensic Analysis of Glass: State of Affairs. First Ecola de Inverno de Ciencias Forenses. Porto Alegre, Brazil (invited speaker)
  159. July 2018. Tatiana Trejos. Forensic Examination of Tapes: Method Innovation and Assessment of Error Rates. First Ecola de Inverno de Ciencias Forenses. Porto Alegre, Brazil (invited speaker)
  160. July 2018. Tatiana Trejos. Integration of LIBS and Electrochemical Methods for the Detection of Gunshot Residues. First Ecola de Inverno de Ciencias Forenses. Porto Alegre, Brazil (invited speaker)
  161. May 2018. Tatiana Trejos. Forensic Applications of Laser-Based Spectrochemical Analysis WVU Workshop on Laser Ablation ICP-MS (LA-ICP-MS) and Laser Induced Breakdown Spectroscopy (LIBS). Morgantown, WV (Workshop Organizer)
  162. May 2018. Tatiana Trejos. Chemical Imaging of Gunshot Residues by Laser-Induced Breakdown Spectroscopy (LIBS). REU site, Research in Chemistry at WVU, Morgantown, WV
  163. April 2018. Korina Menking-Hoggatt, Courtney Vander Pyl, Mandy Ho, and Tatiana Trejos. Versatility of LIBS for Fast Detection of Gunshot Residues. CBDIA meeting, Morgantown, WV (1st place poster award)
  164. April 2018. Nathan Carey, Chelsea Thomson, Katrina Rupert and Tatiana Trejos. Assessment of Transfer and Persistence of Beer and Wine Bottle Glass. CBDIAI meeting, Morgantown, WV (2nd place poster award)
  165. April 2018. Katrina Rupert, Nathan Carey, Paige Schmitt, Mandy Ho and Tatiana Trejos. Transfer and persistence of glass in vehicle glass: experimental studies using mock kidnapping and robbery scenes. CBDIAI meeting, Morgantown, WV
  166. April 2018. Mandy Ho, Courtney Vander Pyl, and Tatiana Trejos. Evaluation of Infrared Imaging for Visualization of Gunshot Residue on Dark Backgrounds and Bloody Samples. CBDIAI meeting, Morgantown, WV
  167. April 2018. Mollie Fisher, Meghan Prusinowski, and Tatiana Trejos. Application of score likelihood ratios for the assessment of duct tape fracture comparisons. CBDIAI meeting, Morgantown, WV
  168. April 2018. Chelsea Thomson, Paige Schmitt, Katrina Rupert, Luis Arroyo and Tatiana Trejos. Transfer and persistence of glass and paint in side and front vehicular collisions. CBDIAI meeting, Morgantown, WV
  169. March 2018. Trejos T. Score Likelihood Ratio Example of Duct Tape Edge Fracture Match. OSAC Trace/Materials Statistics Workshop.
  170. March 2018. Trejos T. Keynote speaker. How forensic scientists help crime fighting? Johnson’s Family Lecture, Park University, Parksville, MO (invited keynote speaker)
  171. March 2018. Trejos T. Keynote speaker. Lecture and workshop: How can minute evidence tell us the story about a crime? Johnson’s Family Lecture, Park University, Parksville, MO (invited keynote speaker)
  172. February 2018. Tatiana Trejos. Elemental Analysis in Forensic and Intelligence Investigations. WVU Department of Chemistry Graduate Colloquium, Morgantown WV (invited speaker)
  173. January 2018. Trejos T, Arroyo L. Identification of organic and inorganic gunshot residues by electrochemical and spectrochemical methods, Impression, Pattern and Trace Evidence Symposium, Jan 22-25, Arlington, VA
  174. January 2018. Trejos T, Thomson C, Rupert K, Carey N. Transfer and persistence of glass: experimental studies involving vehicle and container glass, Impression, Pattern and Trace Evidence Symposium, Jan 22-25, Arlington, VA
  175. January 2018. Trejos T, Prusinowski M, Fisher M. Evaluation of error rates in the determination of duct tape fractures, Impression, Pattern and Trace Evidence Symposium, Jan 22-25, Arlington, VA
  176. September 2017, Trejos, T, K. Menking-Hoggatt, L. Arroyo. Analysis of Gunshot Residues by laser-based spectrochemical methods and electrochemical sensors Combined MAFS, SAFS, ASTEE meeting, September 17-22, 2017, Cincinnati, OH. (Invited, oral presentation)
  177. September 2017, N. Carey, K, Rupert, T. Trejos. Primary and Secondary Transfer of Glass: Lessons Learned from Mock Cases Involving Vehicle and Container Glass, Combined MAFS, SAFS, ASTEE meeting, September 17-22, 2017, Cincinnati, OH. (Invited, oral presentation)
  178. September 2017, M. Prusinowski, A. Brake, T. Trejos. Evaluation of performance rates in the determination of duct tape fracture matches, Combined MAFS, SAFS, ASTEE meeting, September 17-22, 2017, Cincinnati, OH. (Invited, oral presentation)
  179. September 2017, Trejos, T, K. Menking-Hoggatt, L. Arroyo. Fast identification of firearm discharge residues by laser-based spectrochemical methods and electrochemical sensors Combined MAFS, SAFS, ASTEE meeting, September 17-22, 2017, Cincinnati, OH. (Poster presentation)
  180. September 2017, K. Rupert, M. Ho, T. Trejos., Transfer and Persistence of Glass: Experimental Study in a Mock Kidnapping Case Involving the Breaking of a Vehicle Passenger’s Windows, Combined MAFS, SAFS, ASTEE meeting, September 17-22, 2017, Cincinnati, OH. (Poster presentation)
  181. September 2017, M. Ho, K. Rupert, T. Trejos. Validation of Laser Induced Breakdown Spectroscopy (LIBS) Method for Shooting Distance Determination, Combined MAFS, SAFS, ASTEE meeting, September 17-22, 2017, Cincinnati, OH. (Poster presentation)
  182. September 2017, A. Brake, M. Prusinowski, T. Trejos. Evaluation of performance rates in the determination of duct tape fracture matches, Combined MAFS, SAFS, ASTEE meeting, September 17-22, 2017, Cincinnati, OH. (Poster presentation)
  183. September 2017, T. Trejos. Using Laser Ablation Spectrochemical Methods to Assist Forensic Investigations. WVU Department of Geology and Geography Graduate Colloquium Seminar, Morgantown WV, invited speaker.
  184. July 2017, A. Brake, M. Prusinowski, T. Trejos. Assessment of the validity of duct tape end matches in forensic comparisons, Summer Undergraduate Research Symposium, Morgantown, WV. (Poster presentation)
  185. April 2017, K. Rupert, M. Ho, T. Trejos. Study of the Transfer and Persistence of Glass in a Mock Kidnapping Case. 1st Annual Undergraduate Symposium, WVU, Morgantown, WV. (Poster presentation)
  186. April 2017, M. Ho, K. Rupert, T. Trejos. Estimation of shooting distance via 2D-elemental mapping by Laser Induced Breakdown Spectroscopy (LIBS). 1st Annual Undergraduate Symposium, WVU, Morgantown, WV. (Poster presentation)
  187. April 2017, M. Hills, R. Karimi, B. Walls, J. Mink, R. O’Brien and T. Trejos. Effect of Post- Shooting Activity on Distance Determination by Colorimetric Tests. Educational Conference for the Chesapeake Bay Division of the International Association of Identification (CBD-IAI), Frederick, MD. (Poster, First place poster award)
  188. March 2017, Contributions of Costa Rican Women in Science and Technology, UCR-UNESCO Women in Science and Technology Week, San Jose, Costa Rica (Oral presentation, Invited Keynote speaker)