(1) Any person has the right to represent himself or herself in a proceeding before the board.

(2) The only persons who are qualified to represent another person or entity before the board are the following:

(a) Attorneys at law duly qualified and entitled to practice before the highest court of record of any state.

(b) An authorized officer, partner, owner, employee or member of an association, partnership, corporation, organization, government agency or local government.

(c) Legal interns admitted to practice under the applicable admission to practice rules of the Washington state court rules as long as the conditions and limitations of the applicable rules are satisfied.

(d) Any other individual designated by an entity to serve as a spokesperson in a case with the approval of the board's presiding officer.

(3) No former employee of the department, or local jurisdiction, or member of the attorney general's staff may appear in a representative capacity on behalf of other parties in a board proceeding, except when permitted by applicable rules of professional conduct or conflict of interest laws.

(4) No former member of the board shall, for a period of one year after the termination of his or her membership, represent a party before the board on any matter.