14 CFR 13.117 - Conduct of investigative proceeding or deposition.
(a) The Presiding Officer or the designee of the Presiding Officer may question witnesses.
(b) Any witness may be accompanied by counsel.
(1) Question witnesses, provided the questions are relevant and material to the matters under investigation and would not unduly impede the progress of the investigation; and
(2) Make objections on the record and argue the basis for such objections.