The UN Drug Conventions - the 1961 Single Convention on Narcotic Drugs, the 1971 Psychotropic Convention, the 1972 Protocol to the Single Convention and the 1988 UN Drug Trafficking Convention - regulate the global suppression of illicit drugs. This volume examines the provisions of these conventions that require states to adopt penal measures against drugs in their domestic law. Its introductory chapters explore the controversial application of drug prohibition by international society and the historical development of this policy through the penal provisions of the drug conventions. The substantive chapters investigate the various facets of the illicit drug control system created by these penal provisions: crimes and penalties; jurisdiction and extradition; general and specific forms of drug law enforcement co-operation; and the supervision of the system by the UN drug control organs. The conclusion offers a general critique of the system and makes suggestions about its future development.