28 CFR 68.21 - Admissions.
(a) A party may serve upon any other party a written request for the admission, for purposes of the pending action only, of the genuineness and authenticity of any relevant document described in or attached to the request, or for the admission of the truth of any specified relevant matter of fact.
(b) Each matter of which an admission is requested is admitted unless, within thirty (30) days after service of the request or such shorter or longer time as the Administrative Law Judge may allow, the party to whom the request is directed serves on the requesting party:
(1) A written statement denying specifically the relevant matters of which an admission is requested;
(2) A written statement setting forth in detail the reasons why he/she can neither truthfully admit nor deny them; or
(3) Written objections on the ground that some or all of the matters involved are privileged or irrelevant or that the request is otherwise improper in whole or in part.
(c) An answering party may not give lack of information or knowledge as a reason for failure to admit or deny unless the party states that he/she has made reasonable inquiry and that the information known or readily obtainable by him/her is insufficient to enable the party to admit or deny.
(e) A copy of each request for admission and each written response shall be served on all parties.