1. If permitted by the basic principles of their respective domestic legal systems, the Parties shall take the necessary measures, within their possibilities, to allow for the appropriate use of controlled delivery at the international level, on the basis of agreements or arrangements mutually consented to, with a view to identifying persons involved in offences established in accordance with article 3, paragraph 1, and to taking legal action against them.
2. Decisions to use controlled delivery shall be made on a case-by-case basis and may, when necessary, take into consideration financial arrangements and understandings with respect to the exercise of jurisdiction by the Parties concerned.
3. Illicit consignments whose controlled delivery is agreed to may, with the consent of the Parties concerned, be intercepted and allowed to continue with the narcotic drugs or psychotropic substances intact or removed or replaced in whole or in part.