(1) General. In all proceedings in which pleadings are filed and a hearing is held involving the taking of testimony on a record subject to review by the courts, the following persons may appear in a representative capacity:

(a) Attorneys at law duly qualified and entitled to practice before the supreme court of the state of Washington;

(b) Attorneys at law duly qualified and entitled to practice before the highest court of any other state;

(c) Upon permission of the presiding officer, an officer or employee of a party or person seeking party status.

The presiding officer may expel a person who does not have the requisite degree of legal training, experience, or skill to appear in a representative capacity.

(2) Notices of appearance and withdrawal of attorneys. Attorneys or other authorized representatives appearing on behalf of a party or withdrawing from a proceeding shall immediately so notify the council and all parties to the proceeding.

(3) Unethical conduct. All persons appearing in proceedings before the council in a representative capacity shall conform to the standards of ethical conduct required of attorneys before the courts of Washington. If any representative fails to conform to these standards, the council may decline to permit the person to appear in a representative capacity in any proceeding before the council.