Wash. Rev. Code § 26.12.180
All information, records, and reports obtained or created by a guardian ad litem, court-appointed special advocate, or investigator under this title shall be discoverable pursuant to statute and court rule. The guardian ad litem, court-appointed special advocate, or investigator shall not release private or confidential information to any nonparty except pursuant to a court order signed by a judge. The guardian ad litem, court-appointed special advocate, or investigator may share private or confidential information with experts or staff he or she has retained as necessary to perform the duties of guardian ad litem, court-appointed special advocate, or investigator. Any expert or staff retained are subject to the confidentiality rules governing the guardian ad litem, court-appointed special advocate, or investigator. Nothing in this section shall be interpreted to authorize disclosure of guardian ad litem records in personal injury actions.
RCW 26.12.180