Wash. Rev. Code § 9.04.080
In the enforcement of RCW 9.04.050 through 9.04.080 the official enforcing RCW 9.04.050 through 9.04.080 may accept an assurance of discontinuance of any act or practice deemed in violation of RCW 9.04.050 through 9.04.080, from any person engaging in, or who has engaged in such act or practice. Any such assurance shall be in writing and be filed with and subject to the approval of the superior court of the county in which the alleged violator resides or has his or her principal place of business, or in Thurston county. A violation of such assurance shall constitute prima facie proof of a violation of RCW 9.04.050 through 9.04.080: PROVIDED, That after commencement of any action by a prosecuting attorney, as provided herein, the attorney general may not accept an assurance of discontinuance without the consent of the prosecuting attorney.
RCW 9.04.080