More about the drug problem.
D000661:Amphetamine; D001463:Barbiturates; D002188:Cannabis; D004335:Drug and Narcotic Control; D006801:Humans; D007880:Legislation, Drug; D008913:Minority Groups; D009892:Opium; D019966:Substance-Related Disorders; D014481:United States
D001463:Barbiturates; D009892:Opium; D000661:Amphetamine