No. Chapter 5.50 RCW requires that an oath, certification, verification or declaration must be signed or sworn to by the person making it. (Exception: An estate executor or administrator may file a claim for the last completed calendar week prior to a claimant's death.)

(1) You are required to personally certify on your initial application for benefits and weekly claims that the information provided to the department is correct.

(2) An individual with power of attorney may not testify in your place in any adjudicative proceeding. Such individual may file an appeal on your behalf if he or she provides the department with a copy of the document granting him or her power of attorney. Such individual may also be called as a witness on your behalf or assist with the preparation of your case but you must provide sworn testimony in support of your appeal.

(3) An agent with power of attorney may not otherwise act on your behalf when statutes or regulations specifically or implicitly require your signature or personal certification.