(1) Any party to an adjudicative proceeding may be represented or advised by:

(a) An attorney admitted to practice before the Washington state supreme court;

(b) Other attorney admitted to practice before the highest court of any other state, if attorneys from Washington state are permitted to appear in a representative capacity before administrative agencies of that state, and if not otherwise prohibited by Washington law;

(2) A former employee of the office may appear only as permitted in WAC 326-08-035(3).