title: Drug testing challenged.
authors.affiliation: Collen Method, Sacramento, CA.
authors.forename: Mark
authors.initials: M
authors.lastname: Collen
mesh_terms: D000701:Analgesics, Opioid / Q000009:adverse effects* / Q000652:urine*; D005260:Female; D006801:Humans; D008297:Male; D009293:Opioid-Related Disorders / Q000175:diagnosis* / Q000652:urine*; D010146:Pain / Q000188:drug therapy*
chemical_list: D000701:Analgesics, Opioid