5 CFR § 1201.33 - Federal witnesses.
(a) Every Federal agency or corporation, including nonparties, must make its employees or personnel available to furnish sworn statements or to appear at a deposition or hearing when ordered by the judge to do so. When providing those statements or appearing at a deposition or at the hearing, Federal employee witnesses will be in official duty status (i.e., entitled to pay and benefits including travel and per diem, where appropriate). When a desired witness is employed by an agency who is not a party to the Board proceeding, the requesting party may avail itself of the provisions of sections 1201.81 to 1201.85 of this part regarding subpoenas to ensure the attendance of the witness. In addition, the Board and the parties will implement this provision, to the maximum extent possible, to avoid conflict with other regulations governing the production of Federal employees in matters in litigation.
(b) A Federal employee who is denied the official time required by paragraph (a) of this section may file a written request that the judge order the employing agency to provide such official time. The judge will act on such a request promptly and, where warranted, will order the agency to comply with the requirements of paragraph (a) of this section.
(c) An order obtained under paragraph (b) of this section may be enforced as provided under subpart F of this part.