5 C.F.R. § 831.1109 Evidence.
Title 5 - Administrative Personnel
(a) Rules of evidence are not strictly applied, but the presiding officer shall exclude irrelevant or unduly repetitious evidence. (b) Each exhibit of a documentary character shall be submitted to the presiding officer, duly marked, and made a part of the record. An exhibit does not become evidence unless received in evidence by the presiding officer.
Title 5: Administrative Personnel
PART 831—RETIREMENT
Subpart K—Prohibition on Payments of Annuities
§ 831.1109 Evidence.