Wash. Rev. Code § 68.64.060
(1) An individual may refuse to make an anatomical gift of the individual's body or part by:
(a) A record signed by:
(2) A record signed pursuant to subsection (1)(a)(ii) of this section must:
(3) An individual who has made a refusal may amend or revoke the refusal:
[ 2008 c 139 s 7.]