title: The art and science of urine drug testing.
authors.forename: Douglas
authors.initials: D
authors.lastname: Gourlay
authors.forename: Howard A
authors.initials: HA
authors.lastname: Heit
mesh_terms: D000701:Analgesics, Opioid / Q000493:pharmacokinetics / Q000627:therapeutic use / Q000652:urine*; D006801:Humans; D010146:Pain / Q000188:drug therapy / Q000652:urine*
chemical_list: D000701:Analgesics, Opioid