PDFWAC 388-97-4430
Notice—Proof of service.
The department may establish proof of service by any of the following:
(1) A declaration of personal service;
(2) An affidavit or certificate of mailing to the nursing home or to the individual to whom the notice is directed;
(3) A signed receipt from the person who accepted the certified mail, the commercial delivery service, or the legal messenger service package;
(4) Proof of fax transmission; or
(5) Proof of electronic transmission.