Whenever the secretary has been authorized under RCW
74.20.040 to take action to establish, enforce, and collect support moneys, the custodial parent and the child or children are deemed, without the necessity of signing any document, to have appointed the secretary as his or her true and lawful attorney-in-fact to act in his or her name, place, and stead to perform the specific act of endorsing any and all drafts, checks, money orders or other negotiable instruments representing support payments which are received on behalf of said child or children to effect proper and lawful distribution of the support moneys in accordance with 42 U.S.C. Sec. 657.