(6)The provisions of Article 12 of the United Nations Convention are based on a system of monitoring trade in the substances in question. Most trade in these substances is entirely lawful. The documentation of consignments and labelling of these substances should be sufficiently explicit. It is furthermore important, whilst providing competent authorities with the necessary means of action, to develop, within the spirit of the United Nations Convention, mechanisms based on close cooperation with the operators concerned and on the development of intelligence gathering.