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Without prejudice to the application of the provisions of national legislations enabling the Customs authorities of the Contracting Parties to refuse to allow vehicles admitted under cover of temporary importation papers to be driven by persons who have been guilty of serious offences against the Customs or fiscal laws or regulations of the country of temporary importation, vehicles admitted under cover of temporary importation papers may be driven by persons duly authorized by the holders of the papers. The Customs authorities of the Contracting Parties shall have the right to require evidence that such persons have been duly authorized by the holders of the papers; if this evidence does not appear sufficient, the Customs authorities may refuse use of these vehicles in their country under cover of the papers.