(a) Papers and documents relating to the proceedings shall be exempt from both search and seizure; in the event of a dispute the customs officials or police may seal those papers and documents; they shall then be immediately forwarded to the Court for inspection in the presence of the Chief Registrar and of the person concerned; (b) Agents, advisers and lawyers shall be entitled to travel in the course of duty without hindrance. (3) The lawyer acting for a party must lodge at the Registry a certificate that he is authorized to practice before a Court of a member State or of another State, which is a party to the Treaty. Article 29 In order to qualify for the privileges, immunities and facilities specified in Article 28, persons entitled to them should furnish proof of their status as follows: (a) Agents shall produce an official document issued by the party for whom they act, and shall forward without delay a copy thereof to the Chief Registrar. (b) Advisers and lawyers shall produce a certificate signed by the Chief Registrar. The validity of this certificate shall be limited to a specified period, which may be extended or curtailed according to the length of the proceedings. Article 30 1. The privileges, immunities and facilities specified in Article 28 of these Rules are granted exclusively in the interests of the proper conduct of proceedings. 2. The Court may waive the immunity where it considers that the proper conduct of proceedings will not be hindered thereby. Article 31 1. Any adviser or lawyer whose conduct towards the Court or a Judge is incompatible with the dignity of the Court, or who uses his rights for purposes other than those for which they were granted, may at any time be excluded from the proceedings by an order of the Court. The person concerned shall be given an opportunity to defend himself. The order shall have immediate effect. 2. Where an adviser or lawyer is excluded from the proceedings, the proceedings shall be suspended for a period fixed by the President in order to allow the party concerned to appoint another adviser or lawyer. 3. Decisions taken under this Article may be rescinded.