Article 5
Means of transport 1. Transport of samples shall take place in a secure way. 2. The following means of transport shall be regarded as secure: (a) transport by an official of the sending or receiving Member State; (b) transport by courier; (c) transport by diplomatic bag; (d) transport by registered (express) mail. 3. The duly completed Sample Transmission Form referred to in Article 4 shall accompany the sample during the entire transport. 4. The authorities of the Member States involved shall not hinder or detain any transport accompanied by a duly completed Sample Transmission Form unless they have doubts as to whether the transport is carried out lawfully. In case of doubts as to the legal status of the Sample Transmission Form, the national contact point of the Member State detaining the transport shall, without delay, contact the national contact points of the Member States responsible for the completion of the Sample Transmission Form in order to clarify the issue. 5. If the means of transport chosen is transport by an official of the sending or receiving Member State, that official shall not be permitted to wear a uniform. Further, he or she shall not carry out any operational tasks in connection with the transport unless this would be compatible with the applicable national legislation and agreed upon by the sending, transit or receiving Member States. When travelling by aircraft, only airline companies registered in one of the Member States shall be used.