Convention On Psychotropic Substances - Precursors

Precursors

A 1971 Bulletin on Narcotics notes:

Article 2, in paragraph 4 of the original text, carried over the concept in Article 3 (3) (iii) of the Single Convention, and required the application to a "precursor " – i.e. a substance "readily convertible" into a substance under control – of measures of control. In Vienna the complexity of controlling precursors of psychotropic substances was agreed to be so overwhelming that no absolute obligation to control them was provided. The new article 2 in paragraph 9 asks Parties "to use their best endeavours" to apply "such measures of supervision as may be practicable" to substances which may be used in the illicit manufacture of psychotropic substances, i.e. their precursors and possibly also substances essential in the chemistry of manufacture.

This provision was eventually judged to be inadequate, and was strengthened by the United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances's precursor control regime, which established two Tables of controlled precursors. The Commission on Narcotic Drugs and International Narcotics Control Board were put in charge of adding, removing, and transferring substances between the Tables.