12 C.F.R. § 622.106 – Service of subpoena and payment of witness fees.

(a) Service. A subpoena may be served upon the person named therein by personal service or certified mail with a return receipt to the last known address of the person. Witnesses who are subpoenaed shall be paid the same fees and mileage that are paid witnesses in the district courts of the United States. The fees and mileage need not be tendered at the time a subpoena is served.
(b) Motions to quash. Any person to whom a subpoena is directed may, prior to the time specified therein for compliance, but in no event more than 5 days after the date of service of such subpoena, apply to the FCA representative authorized in the order, or if unavailable to the Board, to quash or modify such subpoena, accompanying such application with a brief statement of the reasons therefor. The FCA representative, or the Board, may:
1. (1) Deny the application;
2. (2) Quash or revoke the subpoena;
3. (3) Modify the subpoena; or
4. (4) Condition the granting of the application on such terms as the FCA representative or the Board, determines in his, her, or its discretion, to be just, reasonable, and proper.