49 CFR 835.8: Testimony by current Board employees regarding prior activity.

Any testimony regarding any accident within the Board's jurisdiction, or any expert testimony arising from employment prior to Board service is prohibited absent approval by the General Counsel. Approval shall only be given if testimony will not violate § 835.1 and § 835.3, and is subject to whatever conditions the General Counsel finds necessary to promote the purposes of this part as set forth in § 835.1 and § 835.3.