International Narcotics Control Board
Similarly, heroin-producing countries depend on supplies of acetic anhydride (AA) from the international market. This heroin precursor continues to account for the largest volume of internationally seized chemicals, according to the International Narcotics Control Board. Since July 1999, there have been several notable seizures of acetic anhydride in Turkey (amounting to nearly seventeen metric tons) and Turkmenistan (totaling seventy-three metric tons).