No officer, employee, or agent of the Federal Government engaged in the performance of investigative or prosecutorial functions in connection with any proceeding shall, in that proceeding or a factually related proceeding, participate or advise in the decision of the Administrative Law Judge, except as a witness or counsel in the proceedings.

[54 FR 48596, Nov. 24, 1989. Redesignated by Order No. 1534-91, 56 FR 50053, Oct. 3, 1991]