Washington Revised Code Title 2. Courts of Record § 2.60.020. Federal court certification of local law question

When in the opinion of any federal court before whom a proceeding is pending, it is necessary to ascertain the local law of this state in order to dispose of such proceeding and the local law has not been clearly determined, such federal court may certify to the supreme court for answer the question of local law involved and the supreme court shall render its opinion in answer thereto.