Section 1174.15 - Separation of functions(a) The investigating official, the reviewing official, and any employee or agent of the authority who takes part in investigating, preparing, or presenting a particular case may not, in such case or a factually related case: (1) Participate in the hearing as the ALJ;(2) Participate or advise in the authority head's review of the initial decision; or(3) Make the collection of penalties and assessment.(b) The ALJ must not be responsible to or subject to the supervision or direction of the investigating official or the reviewing official.