Wash. Rev. Code § 20.01.486
A hearing held for the purpose of contesting the determination that an infraction has been committed shall be held without jury. The court may consider the notice of infraction and any other written report submitted by the director. The person named in the notice may subpoena witnesses and has the right to present evidence and examine witnesses present in court. The burden of proof is upon the state to establish the commission of the infraction by preponderance of evidence.
After consideration of the evidence and argument, the court shall determine whether the infraction was committed. Where it is not established that the infraction was committed, an order dismissing the notice shall be entered in the court's record. When it is established that the infraction was committed, an appropriate order shall be entered in the court's record, a copy of which shall be furnished to the director. Appeal from the court's determination or order shall be to the superior court and must be appealed within ten days. The decision of the superior court is subject only to discretionary review pursuant to Rule 2.3 of the rules of appellate procedure.
RCW 20.01.486