RCW 46.83.020: City, town, or county governing bodies to control and supervise—Assistance of county sheriff or city or town police department.

A traffic school established under this chapter shall be under the control and supervision of the governing body of the city, town, or county that has established the traffic school, through such agents, assistants, or instructors as the governing body may designate. The traffic school of a city, town, or county shall be conducted with the assistance of the police department of the city or town or with the assistance of the county sheriff.