title: Preparatory procedures in screening for drugs of abuse: "clean-up" methods in current use.
mesh_terms: D001463:Barbiturates / Q000032:analysis* / Q000097:blood / Q000652:urine; D002845:Chromatography; D002849:Chromatography, Gas; D002852:Chromatography, Ion Exchange; D002855:Chromatography, Thin Layer; D006801:Humans; D007475:Ion Exchange Resins; D008691:Methadone / Q000032:analysis* / Q000097:blood / Q000652:urine; D008722:Methods; D019966:Substance-Related Disorders
chemical_list: D001463:Barbiturates; D007475:Ion Exchange Resins; D008691:Methadone