On February 21, 1971, the United Nations Convention on Psychotropic Substances was signed in Vienna, Austria. The Convention was promulgated to regulate psychotropic drugs, extending the 1961 U.N. Single Convention on Narcotic Drugs, which applied to cannabis-, cocoa-, and opium-based drugs. In 1988, the U.N. Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances was