RCW 71.05.220

At the time a person is involuntarily admitted to an evaluation and treatment facility, secure withdrawal management and stabilization facility, or approved substance use disorder treatment program, the professional person in charge or his or her designee shall take reasonable precautions to inventory and safeguard the personal property of the person detained. A copy of the inventory, signed by the staff member making it, shall be given to the person detained and shall, in addition, be open to inspection to any responsible relative, subject to limitations, if any, specifically imposed by the detained person. For purposes of this section, "responsible relative" includes the guardian, conservator, attorney, spouse, parent, adult child, or adult brother or sister of the person. The facility shall not disclose the contents of the inventory to any other person without the consent of the patient or order of the court.