To prevent the diversion of precursor chemicals for use in the illicit manufacture of drugs, governments must have adequate legislation in line with the United Nations Convention against Illicit Traffic in Narcotic Drugs and Psychotropic Substances as well as effective working mechanisms and procedures for information feedback between the authorities involved in the control of precursor chemicals. The International Narcotics Control Board in its annual report examines actions taken recently and highlights both successful results and shortcomings. The 2011 precursors report of the Board presents the latest developments in global precursor chemical control.