(1) Rules of the commission shall be adopted by the commission or a designee in accordance with chapter
34.05 RCW.
(2) Rules of the commission shall be admitted as evidence in the courts of the state when accompanied by an affidavit from the commission or a designee certifying that the rule has been lawfully adopted and the affidavit is prima facie evidence of the adoption of the rule.
(3) The commission may designate department employees to act on the commission's behalf in the adoption and certification of rules.