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Section 20. Privileges and immunities are granted to officials in the interests of the United Nations and not for the personal benefit of the individuals themselves. The SecretaryGeneral shall have the right and the duty to waive the immunity of any official in any case where, in his opinion, the immunity would impede the course of justice and can be waived without prejudice to the interests of the United Nations. In the case of the Secretary-General, the Security Council shall have the right to waive immunity. Section 21. The United Nations shall co-operate at all times with the appropriate authorities of Members to facilitate the proper administration of justice, secure the observance of police regulations and prevent the occurrence of any abuse in connection with the privileges, immunities and facilities mentioned in this Article. Article Vl.—Experts on Missions for the United Nations Section 22. Experts (other than officials coming within the scope of Article V) performing missions for the United Nations shall be accorded such privileges and immunities as are necessary for the independent exercise of their functions during the period of their missions, including the time spent on journeys in connection with their missions. In particular they shall be accorded : (a) Immunity from personal arrest or detention and from seizure of their personal baggage : (b) In respect of words spoken or written and acts done by them in the course of the performance of their mission, immunity from legal process of every kind. This immunity from legal process shall continue to be accorded notwithstanding that the persons concerned are no longer employed on missions for the United Nations : (V) Inviolability for all papers and documents : (d) For the purpose of their communications with the United Nations, the right to use codes and to receive papers or correspondence by courier or in sealed bags : (e) The same facilities in respect of currency or exchange restrictions as are accorded to representatives of foreign governments on temporary official missions : (f) The same immunities and facilities in respect of their personal baggage as are accorded to diplomatic envoys.