49 CFR 386.3 - Separation of functions.
(b) An Agency employee, including those listed in paragraph (c) of this section, engaged in the performance of investigative or prosecutorial functions in a civil penalty proceeding may not, in that case or a factually related case, discuss or communicate the facts or issues involved with the Agency decisionmaker, Administrative Law Judge, Hearing Officer or others listed in paragraph (d) of this section, except as counsel or a witness in the public proceedings. This prohibition also includes the staff of those covered by this section.
(c) The Deputy Chief Counsel, Assistant Chief Counsel for Enforcement and Litigation, and attorneys in the Enforcement and Litigation Division serve as enforcement counsel in the prosecution of all cases brought under this part.
(e) Nothing in this part shall preclude agency decisionmakers or anyone advising an agency decisionmaker from taking part in a determination to launch an investigation or issue a complaint, or similar preliminary decision.