title: Testing for drug use: why, when, and what for.
mesh_terms: D001944:Breath Tests; D003128:Coma / Q000139:chemically induced; D005188:False Negative Reactions; D005189:False Positive Reactions; D003932:Heroin / Q000506:poisoning; D006801:Humans; D008487:Medical History Taking; D008722:Methods; D009269:Nalorphine; D004364:Pharmaceutical Preparations / Q000032:analysis; D011680:Pupil / Q000187:drug effects; D013375:Substance Withdrawal Syndrome; D019966:Substance-Related Disorders / Q000150:complications / Q000175:diagnosis*
chemical_list: D004364:Pharmaceutical Preparations; D003932:Heroin; D009269:Nalorphine