Commissioners and employees shall disqualify themselves if they:
have a personal bias or prejudice concerning a party;
before employment with the commission, served or participated as a lawyer or material witness in the pending proceeding; or
have an interest, other than that of the general public, that could be substantially affected by the outcome of the proceeding.
Written disclosure; withdrawal.
The commissioner or employee shall disclose in writing within 48 hours to the commission the disqualifying interest and withdraw, taking no part in the pending proceeding.