Utility of gas chromatography infrared spectroscopy (GC-IR) for the differentiation of positional isomers of fentanyl related substances Posted on October 13, 2023October 13, 2023 By Becky Carter Kimiko Ferguson, Sherri L. Tupik, Hunter Haddad, Jeannette Perr, Michael Gilbert, Reta Newman, José Almirall Forensic Chem; 29; 2022 Download PDF Chemistry, Crime Scene Investigation and Reconstruction, DREs / Traffic Safety Resource Prosecutors, Forensic Pathology and Medicolegal Death Investigation, Seized Drugs/Controlled Substances, Toxicology