Wash. R. App. P. 10.6

(a) When Allowed by Motion. The appellate court may on motion grant permission to file

an amicus curiae brief only if all parties consent, or if the filing of the brief would assist the

appellate court. An amicus curiae brief may be filed only by an attorney authorized to practice

law in this state, or by a member in good standing of the Bar of another state in association with

an attorney authorized to practice law in this state.

(b) Motion. A motion to file an amicus curiae brief must include a statement of

(1) applicant’s interest and the person or group applicant represents, (2) applicant’s familiarity

with the issues involved in the review and with the scope of the argument presented or to be

presented by the parties, (3) specific issues to which the amicus curiae brief will be directed, and

(4) applicant’s reason for believing that additional argument is necessary on these specific issues.

The brief of amicus curiae may be filed with the motion.

(c) On Request of the Appellate Court. The appellate court may ask for an amicus brief

at any stage of review, and establish appropriate timelines for the filing of the amicus brief and

answer thereto.

(d) Objection to Motion. An objection to a motion to file an amicus curiae brief must be

received by the appellate court and counsel of record for the parties and the applicant not later

than 5 business days after receipt of the motion.

(e) Disposition of Motions. The Supreme Court and each division of the Court of Appeals

shall establish by general order the manner of disposition of a motion to file an amicus curiae

brief, including whether such disposition is reviewable or subject to reconsideration by the

particular court.