Section 390.8 - Separation of functions(a) An Agency employee who has taken an active part in investigating, prosecuting, advocating, or making an initial Agency determination in a proceeding under § 380.723 , § 382.717 , § 390.115 , § 390.135 , or § 391.47 of this chapter or section 5.4 to appendix A to subpart B of part 395 of this chapter may not, in that case or a factually-related case, advise or assist the Agency official authorized to issue a final decision in the applicable proceeding.(b) Nothing in this section shall preclude the Agency official authorized to issue a final decision or anyone advising that Agency official from taking part in a determination to launch an investigation or issue a complaint, or similar preliminary decision.