Validating Liquid Chromatography–Mass Spectrometry for Urine and Oral Fluid Drug Testing – Method Validation Part 4 (4 of 5) Posted on November 1, 2023November 1, 2023 By Jeff Teitelbaum Leland McClure Drug Testing Matters; National Laboratory Certification Program; October 2023 Access report Alcohol, Cannabis and Cannabinoids, Chemistry, Crime Scene Investigation and Reconstruction, DREs / Traffic Safety Resource Prosecutors, Forensic Pathology and Medicolegal Death Investigation, Seized Drugs/Controlled Substances, Toxicology