Wash. Rev. Code § 26.27.541
(1) In a case arising under this chapter or involving the Hague Convention on the Civil Aspects of International Child Abduction, the prosecutor or attorney general may take any lawful action, including resorting to a proceeding under this article or any other available civil proceeding to locate a child, obtain the return of a child, or enforce a child custody determination if there is:
[ 2001 c 65 s 315.]