(a) No ex parte communications. Unless required for the disposition of an ex parte matter authorized by law, during the pendency of a contested case either at SOAH or before the commission, no party, person, or their representatives shall communicate directly or indirectly with any commissioner or the judge concerning any issue of fact or law relative to the pending case, except on notice and opportunity for all parties to participate.(b) Utilizing special skills of the commission. The judge may seek the special skills or knowledge of commission staff in evaluating the evidence in a contested case. The judge shall follow the following procedure.(1) The judge shall issue an order, copied to all parties, asking the executive director to assign a staff person with expertise who has not participated in the proceeding or in the processing of the matter being considered for potential consultation.(2) All communications between the designated staff expert and the judge shall be either recorded or in writing, and all such communications submitted to or considered by the judge shall be made available as public records when the proposal for decision is issued.(3) During the pendency of the case either before the judge or at the commission, no party, person, or their representatives shall communicate directly or indirectly with the designated staff expert assigned to help the judge concerning any issue of fact or law relative to the pending case, except on notice and opportunity for all parties to participate.