28 C.F.R. § 814.9
(2) Oral hearing. An employee who requests an oral hearing shall be provided an oral hearing, if the hearing official determines that the matter cannot be resolved by review of documentary evidence alone (e.g., when an issue of credibility or veracity is involved). Where an oral hearing is appropriate, the hearing is not an adversarial adjudication and need not take the form of an evidentiary hearing, e.g., the rules of evidence do not apply. Oral hearings may take the form of, but are not limited to:
(2) Content of decision. The written decision shall include: