Wash. Rev. Code § 49.84.040
(1) A person, including but not limited to an employer, his or her agent, or person acting as or on behalf of a hiring entity, or the officer or agent of any entity, business, corporation, partnership, or limited liability company, may not discharge or in any way retaliate, discriminate, or take adverse action against an employee or former employee for exercising any rights established in this chapter, or for being perceived as exercising rights established in this chapter including, but not limited to:
(3)
(b) The presumption may be rebutted by a preponderance of the evidence that:
[ 2023 c 306 s 8.]