Wash. Rev. Code § 19.330.050
(1) No action may be brought under RCW 19.330.020 unless the person subject to RCW 19.330.020 received written notice of the alleged use of the stolen or misappropriated information technology from the owner or exclusive licensee of the information technology or the owner's agent and the person:
(2) To satisfy the requirements of this section, written notice must, under penalty of perjury:
[ 2011 c 98 s 5.]