In accordance with the Board's mandate under the United Nations Convention against Illicit Traffic in Narcotic Drugs and Psychotropic Substances of 1988, the annual reports on precursors provide an overview of the most important actions taken to implement article 12 of that Convention and to strengthen the functioning of the international precursor control system in any given year. The reports also provide a detailed account of the latest trends and developments in legitimate international trade and in trafficking in precursor chemicals under international control, as well as their non-scheduled substitutes and alternatives.