International treaties concerned with the control of production and distribution of psychoactive drugs. The first treaty dealing with controlled substances was the Hague Convention of 1912: its provisions and those of succeeding agreements were consolidated in the 1961 Single Convention on Narcotic Drugs (amended by a 1972 protocol). To this have been added the 1971 Convention on Psychotropic Substances and the 1988 Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances.
