A controlled substance is a drug or a chemical whose manufacture, possession or distribution is highly regulated by governments and subject to legislative control. For example, controlled drugs include: illegal drugs, prescription medications and chemicals considered precursors to the production of illegal drugs. These drugs are all considered likely to cause harm to an individual, if not properly used.1
Manufacture and distribution of controlled drugs is closely monitored globally by the United Nations. The construction of an international legal framework for controlled drugs has undergone several stages of development since the 1920 alcohol prohibition in the US. In 1961, the single convention on narcotic drugs was established as a universal system to limit the cultivation, production, distribution, trade, use and possession of narcotic substances strictly to medical and scientific purposes, with special attention to substances produced from plants.2
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