The limits of narcotics law enforcement.
D002188:Cannabis; D003042:Cocaine; D003415:Crime; D003932:Heroin; D006801:Humans; D007880:Legislation, Drug / Q000639:trends; D009293:Opioid-Related Disorders / Q000517:prevention & control* / Q000523:psychology; D019966:Substance-Related Disorders / Q000523:psychology; D014481:United States
D003932:Heroin; D003042:Cocaine