41 CFR § 60-30.17 - Appearance of witnesses.
(a) A party wishing to procure the appearance at the hearing of any person having personal or expert knowledge of the matters in issue shall serve on the prospective witness a notice, which may be accomplished by an administrative subpoena, setting forth the time, date, and place at which he is to appear for the purpose of giving testimony. The notice shall also set forth the categories of documents the witness is to bring with him to the hearing, if any. A copy of the notice shall be filed with the Administrative Law Judge and additional copies shall be served upon the opposing parties.
(b) It shall be the obligation of each party to produce for examination any person, along with such documents as may be requested, at the time and place, and on the date, set forth in the notice, if that party has control over such person. Each party shall be deemed to have control over its officers, agents, employees, and members. Due regard shall be given to the convenience of witnesses in scheduling their testimony so that they will be detained no longer than reasonably necessary.
(c) The party or prospective witness may file an objection within 5 days after notice of production of such witness is served stating with particularity the reasons why the party cannot produce a requested witness. The party serving the notice may move for an order with respect to such objection or failure to produce a witness.