Webinar: Regioisomer Differentiation for Substances Using GC-IR [Archival]

Webinar: Regioisomer Differentiation for Substances Using GC-IR [Archival]


Forensic examiners are called upon to conduct detailed chemical analyses of drugs, precursors, and related chemicals that may be present with imposter substances, isomers, or other compounds that may interfere with analysis. Gas chromotograph mass spectrometry (GCMS) has been the analytical instrument of choice for these analyses, but GCMS may not distinguish among many drug substances and related chemicals. Dr. Randall Clark at Auburn University has applied gas chromatography combined with infrared spectroscopy (GC-IR) to provide an alternative for analysis by forensic labs. In this webinar, Dr. Clark presented an overview of regioisomer differentiation using GC-IR and describe the advantages of the technique. He was joined by Mr. Lewis Smith of the New Jersey Police Department to describe his experience and advice in implementing GC-IR in a forensic lab. As synthetic compounds, new precursors, and isomers proliferate, it will become increasingly important for forensic laboratories to recognize the limitations of GCMS and have the ability to use GCIR when needed.

A certificate of completion is available for all who register and attend this webinar.


  • Randall Clark
  • Lewis Smith

Funding for this Forensic Technology Center of Excellence webinar has been provided by the National Institute of Justice, Office of Justice Programs, U.S. Department of Justice.

The opinions, findings, and conclusions or recommendations expressed in this webinar are those of the presenter(s) and do not necessarily reflect those of the U.S. Department of Justice.

Contact us at with any questions and subscribe to our newsletter for notifications.

Related Content

What FSSP Leaders Should Know about Artificial Intelligence and its Application to Forensic Science In-Brief

Date December 2023 Overview Artificial intelligence (AI), which leverages computers to perform tasks that enhance decision-making, problem-solving capabilities, and technology-driven innovativeness,” is a rapidly growing area of interest for both industry and the federal research and development (R&D) community.1 For forensic science service…

FLN-TWG: A Roadmap to Improve Research and Technology Transition in Forensic Science

← Back to FLN-TWG Main Page  Forensic Laboratory Needs Technology Working Group (FLN-TWG) The National Institute of Justice (NIJ), in partnership with the Forensic Technology Center of Excellence (FTCOE) at RTI International, formed the Forensic Laboratory Needs Technology Working Group…
brain, DNA, bloodstain

Human Factors in Forensic Science Practice Sourcebook

Publication Forensic Science International: Synergy, March 2022 Editors Heidi Eldridge, PhD | RTI International Barbara A. Spellman, JD, PhD | University of Virginia School of Law Thomas Busey, PhD | Indiana University, Psychological and Brain Sciences Working Group Members Paul…