title: Letter: Profiency testing in forensic toxicology: criteria for experimental design.
mesh_terms: D001463:Barbiturates / Q000032:analysis; D005069:Evaluation Studies as Topic; D005554:Forensic Medicine; D006801:Humans; D004364:Pharmaceutical Preparations / Q000032:analysis*; D011786:Quality Control
chemical_list: D001463:Barbiturates; D004364:Pharmaceutical Preparations