Washington Motion and Declaration for Service of Summons by Mail is a legal document used in the state of Washington to serve a summons and complaint to a defendant in a civil case. The motion is typically filed by the plaintiff, and it requests permission from the court to serve the defendant through mail rather than in-person or by another legal means. It must be accompanied by a declaration, signed by the plaintiff or an authorized representative, attesting to the plaintiff's efforts to locate the defendant and to confirm their address. There are two types of Washington Motion and Declaration for Service of Summons by Mail: the first is known as "substituted service," which is used when the plaintiff is unable to locate the defendant in order to serve them in person. The second type is known as "constructive service," which is used when the plaintiff knows the defendant's address but is unable to serve them in person due to extenuating circumstances. In both cases, the motion and declaration must be signed and filed with the court.