Controlled substance
DRUG WHOSE MANUFACTURE, POSSESSION, OR USE IS REGULATED BY A GOVERNMENT
Controlled substances; Illegal substances; Illegal substance; Illicit substances; Illicit substance
A controlled substance is generally a drug or chemical whose manufacture, possession and use is regulated by a government, such as illicitly used 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, which have been incorporated into national laws; however, national laws usually significantly expand on these international conventions.