controlled substance

A controlled substance is generally a drug or chemical whose manufacture, possession, and use is regulated by a government, such as illicitly-obtained drugs or prescription medications that are designated by law. Some treaties, notably the Single Convention on Narcotic Drugs, the Convention on Psychotropic Substances, and the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances, provide internationally agreed-upon "schedules" of controlled substances, w