The Single Convention on Narcotic Drugs, 1961 (also called the Single Convention, 1961 Convention, or C61) is an international treaty that controls activities (cultivation, production, supply, trade, transport) involving specific narcotic drugs and lays down a system of regulations (licenses, measures for treatment, research, etc.) for their medical and scientific uses, concluded under the auspices of the United Nations. The convention also establishes the International Narcotics Control Board.
The Single Convention was adopted in 1961 and amended in 1972. As of 2022, the Single Convention as amended has been ratified by 186 countries. The convention has since been supplemented by the 1971 Convention on Psychotropic Substances, which controls LSD, MDMA, and other psychoactive pharmaceuticals, and the 1988 United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances; the three conventions establish the legal framework for international drug control.
Ratification
The Single Convention as amended in 1972 had been ratified or acceded to by 186 states. Only Chad remained party to the original 1961 Convention in its unamended form. The Cook Islands, Equatorial Guinea, Kiribati, Nauru, Niue, Samoa, South Sudan, Timor-Leste, Tuvalu, and Vanuatu are not parties.
Since the Single Convention is not self-executing, parties must enact legislation to carry out its provisions, and the UNODC works with countries' legislatures to ensure compliance.
History
The League of Nations adopted several drug control treaties prior to World War II, such as the First and Second International Opium Convention, and International Convention relating to Dangerous Drugs (1925) specifying uniform controls on addictive drugs such as cocaine and opium, and its derivatives. However, the lists of controlled substances were fixed in the treaties' text. Consequently, it was necessary to periodically amend or supersede the conventions with the introduction of new treaties to keep up with advances in chemistry. According to a 1954 interview with United States Commissioner of Narcotics Harry J. Anslinger, the cumbersome process of conference and state-by-state ratification could take many decades.
A Senate of Canada committee reported: "The work of consolidating the existing international drug control treaties into one instrument began in 1948, but it was 1961 before an acceptable third draft was ready." That year, the UN Economic and Social Council convened a plenipotentiary conference of 73 nations for the adoption of a single convention on narcotic drugs. That meeting was known as the United Nations Conference on Narcotic Drugs. The participating states organized themselves into five distinct caucuses:
- Organic states group: As producers of the organic raw materials for most of the global drug supply, these countries had been the traditional focus of international drug control efforts. They were open to socio-cultural drug use, having lived with it for centuries or rather millennia. While India, Turkey, Pakistan and Burma took the lead, the group also included the coca-producing states of Indonesia and the Andean region of South America, the opium- and cannabis-producing countries of South and Southeast Asia, and the cannabis-producing states in the Horn of Africa. They favored weak controls because existing restrictions on production and export had directly affected large segments of their domestic population and industry. They supported national control efforts based on local conditions and were wary of strong international control bodies under the UN. Essentially powerless to fight the prohibition philosophy directly, they could only force a compromise by working together to dilute the treaty language with exceptions, loopholes and deferrals. They also sought development aid to compensate for losses caused by strict controls.
- Manufacturing states group: This group included primarily Western industrialized nations, the key players being the United States, the United Kingdom, Canada, Switzerland, the Netherlands, West Germany, and Japan. Having no cultural affinity for organic drug use and being faced with the effects that drug abuse was having on their citizens, they advocated stringent controls on the production of organic raw materials and on illicit trafficking. As the principal manufacturers of synthetic psychotropics, and backed by a determined industry lobby, they forcefully opposed undue restrictions on medical research or the production and distribution of manufactured drugs. They favored strong supranational control bodies as long as they continued to exercise de facto control over such bodies. According to W.B. McAllister's Drug Diplomacy in the Twentieth Century, their strategy was essentially to "shift as much of the regulatory burden as possible to the raw-material-producing states while retaining as much of their own freedom as possible."
- Strict control group: These were essentially non-producing and non-manufacturing states with no direct economic stake in the drug trade. The key members were France, Sweden, Brazil, and the Republic of China. Most of the states in this group were culturally opposed to drug use and suffered from abuse problems. They favored restricting drug use to medical and scientific purposes and were willing to sacrifice a degree of national sovereignty to ensure the effectiveness of supranational control bodies. They were forced to moderate their demands to secure the widest possible agreement.
- Weak control group: This group was led by the Soviet Union and often included its allies in Europe, Asia and Africa. They considered drug control a purely internal issue and adamantly opposed any intrusion on national sovereignty, such as independent inspections. With little interest in the drug trade and minimal domestic abuse problems, they refused to give excessive power to any supranational body, especially over internal decision-making.
- Neutral group: This was a diverse group including most of the African countries, Central America, sub-Andean South America, Luxembourg and the Vatican. They had no strong interest in the issue apart from ensuring their own access to sufficient drug supplies. Some voted with political blocs, others were willing to trade votes, and others were truly neutral and could go either way on the control issue depending on the persuasive power of the arguments presented. In general, they supported compromise with a view to obtaining the broadest possible agreement.
These competing interests, after more than eight weeks of negotiations, finally produced a compromise treaty. Several controls were weakened; for instance, the proposed mandatory embargoes on nations failing to comply with the treaty became recommendations. The 1953 New York Opium Protocol, which had not yet entered into force, limited opium production to seven countries; the Single Convention lifted that restriction, but instituted other regulations and put the International Narcotics Control Board in charge of monitoring their enforcement. A compromise was also struck that allowed heroin and some other drugs classified as particularly dangerous to escape absolute prohibition.
The Single Convention created four Schedules of controlled substances and a process for adding new substances to the Schedules without amending the treaty. The Schedules were designed to have significantly stricter regulations than the two drug "Groups" established by predecessor treaties. For the first time, cannabis was added to the list of internationally controlled drugs. In fact, regulations on the cannabis plant – as well as the opium poppy, the coca bush, poppy straw and cannabis tops – were embedded in the text of the treaty, making it impossible to deregulate them through the normal Scheduling process. A 1962 issue of the Commission on Narcotic Drugs' Bulletin on Narcotics proudly announced that "after a definite transitional period, all non-medical use of narcotic drugs, such as opium smoking, opium eating, consumption of cannabis (hashish, marijuana) and chewing of coca leaves, will be outlawed everywhere. This is a goal which workers in international narcotics control all over the world have striven to achieve for half a century."
A 3 August 1962, Economic and Social Council resolution ordered the publication of the Commentary on the Single Convention on Narcotic Drugs. The legal commentary was written by the United Nations Secretary-General staff member Adolf Lande, the former Secretary of the Permanent Central Narcotics Board and Drug Supervisory Body, operating under a mandate to give "an interpretation of the provisions of the Convention in the light of the relevant conference proceedings and other material." The Commentary contains the Single Convention's legislative history and can be a valuable aid to interpreting the treaty, when used alongside contemporaneous sources such as the Official Records.
The Single Convention entered into force on 13 December 1964, having met Article 41's requirement of 40 ratifications. As of 1 January 2005, 180 states were Parties to the treaty. Others, such as Cambodia, have committed to becoming Parties.
On 21 May 1971, the UN Economic and Social Council called a conference of plenipotentiaries to consider amendments to the Single Convention. The conference met at the United Nations Office at Geneva from 6 to 24 March 1972, producing the 1972 Protocol Amending the Single Convention on Narcotic Drugs. The amendments entered into force on 8 August 1975.
On 11 November 1990, mechanisms for enforcing the Single Convention were expanded significantly by the entry into force of the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances, which had been signed at Vienna on 20 December 1988. The Preamble to this treaty acknowledges the inadequacy of the Single Convention's controls to stop "steadily increasing inroads into various social groups made by illicit traffic in narcotic drugs and psychotropic substances". The new treaty focuses on stopping organized crime by providing for international cooperation in apprehending and convicting gangsters and starving them of funds through forfeiture, asset freezing, and other methods. It also establishes a system for placing precursors to Scheduled drugs under international control. Some non-Parties to the Single Convention, such as Andorra, belong to this treaty and thus are still under the international drug control regime.
Provisions
Purposes
Medical and scientific purposes
The Single Convention repeatedly affirms the importance of medical use of controlled substances. The Preamble notes that "the medical use of narcotic drugs continues to be indispensable for the relief of pain and suffering and that adequate provision must be made to ensure the availability of narcotic drugs for such purposes". Articles 1, 2, 4, 9, 12, 19, and 49 contain provisions relating to "medical and scientific" use of controlled substances. In almost all cases, parties are permitted to allow dispensation and use of controlled substances under a prescription, subject to record-keeping requirements and other restrictions.
The Single Convention unambiguously condemns "abuse of drugs", even stating that "addiction to narcotic drugs constitutes a serious evil for the individual and is fraught with social and economic danger to mankind". It aims to limit the global production of controlled drugs to an amount adequate to satisfy the estimated global demand for medical and scientific purposes without producing a surplus that could lead to diversion and addiction. Article 4 requires nations to take legislative and administrative measures necessary to limit production, trade, use and possession of drugs to medical and scientific purposes. Article 49 allowed countries to temporarily permit coca leaf chewing, opium smoking, and other traditional drug uses at the time of signature, ratification, or accession, but provides that countries opting to do so would be required to phase out these and other traditional uses by specific dates after the convention came into force.
As of 2025, 138 substances are controlled under the Single Convention.
Non-medical and non-scientific purposes
The Single Convention contains specific exemptions for drugs used for non-medical and non-scientific purposes. The broadest is article 2 paragraph 9 of the Single Convention, which permits a country to unilaterally exempt a drug that is commonly used in industry from nearly all control requirements of the convention, provided that the country ensures by appropriate means that the drug is not liable to be abused or have ill effects, and that the country include the quantity of the drug exempted under this article in its annual statistical submissions.