2. The measures referred to in paragraph 1 of this article shall include, in particular:
(a)Co-ordinated action for the prevention and repression of the use of the mails for illicit traffic;
(b)Introduction and maintenance by authorized law enforcement personnel of investigative and control techniques designed to detect illicit consignments of narcotic drugs, psychotropic substances and substances in Table I and Table II in the mails;
(c)Legislative measures to enable the use of appropriate means to secure evidence required for judicial proceedings.