Separation of functions.

(a)General. An agency employee who assists in the investigation or prosecution of an enforcement case may not participate in the decision of that case or a factually related one, but may participate as a witness or counsel at a hearing as set forth in this subpart. Likewise, an agency employee who prepares a decision in an enforcement case may not have served in an investigative or prosecutorial capacity in that case or a factually related one.#

(b)Prohibition on ex parte communications. A party to an enforcement proceeding, including the respondent, its representative, or an agency employee having served in an investigative or prosecutorial capacity in the proceeding, may not communicate privately with the Associate Administrator, Presiding Official, or attorney drafting the recommended decision concerning information that is relevant to the questions to be decided in the proceeding. A party may communicate with the Presiding Official regarding administrative or procedural issues, such as for scheduling a hearing.#