Wash. Rev. Code § 46.37.535
It is unlawful for any person to rent out motorcycles, motor-driven cycles, or mopeds unless the person also has on hand for rent helmets of a type conforming to rules adopted by the state patrol.
It shall be unlawful for any person to rent a motorcycle, motor-driven cycle, or moped unless the person has in his or her possession a helmet of a type approved by the state patrol, regardless of from whom the helmet is obtained.
RCW 46.37.535
Rules of court: Monetary penalty schedule-IRLJ 6.2.
Short title-1990 c 270: See RCW 43.70.440.
Construction-Application of rules-Severability-1987 c 330: See notes following RCW 28B.12.050.
Severability-1977 ex.s. c 355: See note following RCW 46.37.010.
License requirement for person renting motorcycle: RCW 46.20.220.