Page 65 success. What is needed therefore is international cooperation quite unlike others, as provided by the United Nations. Methods at the international level to combat drug trafficking include:  The United Nations Single Convention on Narcotic Drugs (1961) which aims to limit the possession, use, trade in, distribution, import, export, manufacture and production of drugs exclusively to medical and scientific purposes and to address drug trafficking through international cooperation to deter and discourage drug traffickers. The 1972 protocol amending the Convention stresses the importance of treating and reintegrating drug addicts;  The United Nations Convention on psychotropic substances (1971), which establishes an international system to combat psychotropic substances, to control the wide diversity of drugs;  United Nations Convention against Illicit Traffic in Narcotic Drugs and Psychotropic Substances (1988) (see ABC of the United Nations P. 218-219 (of the French text)). Apart from legal measures, UNDCP has been fighting the drug problem through various community programmes for the prevention, treatment and rehabilitation of drug addicts under: - The social programme on illegal crops surveillance ; - The global evaluation programme, which publishes reliable updated statistics on illicit drug consumption worldwide.  Legal assistance programme Under this programme, several judges and 1,700 judicial staff were trained in drug control legislation and over 140 countries received legal assistance. The need for concerted action, initiated by the United Nations, compelled the Heads of State of the Central African sub-region to adopt a decision on the authorization of the community‟s Secretary General, to sign the official act confirming the 1988 United Nations Convention against the Illicit traffic in Narcotic Drugs and Psychotropic Substances.