An Enhanced LC–MS-MS Technique for Distinguishing Δ8- and Δ9-Tetrahydrocannabinol Isomers in Blood and Urine Specimens Posted on April 22, 2022 By Becky Carter Jami D Reber, Erin L Karschner, Joshua Z Seither, Jessica L Knittel, Katherine V Dozier, Jeffrey P Walterscheid J Anal Tox; 46(4); 2022 Access article Cannabis and Cannabinoids, Chemistry, Crime Scene Investigation and Reconstruction, DREs / Traffic Safety Resource Prosecutors, Seized Drugs/Controlled Substances, Toxicology