Proof of service.
5 C.F.R. § 1201.84
in effectEffective: 2024-07-01The person who has served the subpoena must certify that he or she did so:
(a) By delivering it to the witness in person,
(b) By registered or certified mail, or
(c) By delivering the subpoena to a responsible person (named in the document certifying the delivery) at the residence or place of business (as appropriate) of the person for whom the subpoena was intended.
Source: eCFRURL: https://www.ecfr.gov/api/versioner/v1/full/2024-07-01/title-5.xmlFetched: 7/26/2026