The party requesting a subpoena shall pay the cost of the fees and
mileage of any witness subpoenaed 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.