(1) An administrative law judge (ALJ) or review judge may be disqualified for bias, prejudice, or conflict of interest, or if one of the parties or a party's representative has ex parte contact with the ALJ or review judge.

(2) Ex parte contact means any written or oral communication with the ALJ or review judge about something related to the hearing when the other parties are not present. Procedural questions are not considered an ex parte contact. Examples of procedural questions include clarifying the hearing date, time, or location, or asking for directions to the hearing location.

(3) To request disqualification of an ALJ or review judge, a party must file a written petition for disqualification consistent with RCW 34.05.425 explaining why the ALJ or review judge should be disqualified. A party must promptly file the petition upon discovery of possible bias, conflict of interest, or ex parte contact.

(4) A party must deliver the petition to the ALJ or review judge assigned to the case. That ALJ or review judge must decide whether to grant or deny the petition and must state the facts and reasons for the decision.