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Electronic Code of Federal Regulations
Title 14: Aeronautics and Space
The party requesting a supoena shall pay the cost of the fees and mileage of any witness supoenaed in the amounts that would be payable to a witness in a proceeding in United States District Court. A check for witness fees and mileage shall accompany the subpoena when served, except that when a subpoena is issued on behalf of the authority, a check for witness fees and mileage need not accompany the subpoena.