title: Use of charcoal to concentrate drugs from urine before drug analysis.
mesh_terms: D000661:Amphetamine / Q000652:urine; D001463:Barbiturates / Q000652:urine; D002606:Charcoal; D002845:Chromatography; D002855:Chromatography, Thin Layer; D003042:Cocaine / Q000652:urine; D005069:Evaluation Studies as Topic; D005984:Glutethimide / Q000652:urine; D006801:Humans; D008722:Methods; D009294:Narcotics / Q000652:urine; D019966:Substance-Related Disorders / Q000652:urine*
chemical_list: D001463:Barbiturates; D009294:Narcotics; D002606:Charcoal; D005984:Glutethimide; D000661:Amphetamine; D003042:Cocaine