28 C.F.R. § 71.25 Fees.
Title 28 - Judicial Administration
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.
Title 28: Judicial Administration
PART 71—IMPLEMENTATION OF THE PROVISIONS OF THE PROGRAM FRAUD CIVIL REMEDIES ACT OF 1986
Subpart A—Implementation for Actions Initiated by the Department of Justice
§ 71.25 Fees.