Wash. Rev. Code § 18.73.180
Other vehicles not herein defined by this chapter shall not be used for transportation of patients who must be carried on a stretcher or who may require medical attention en route, except that such transportation may be used when:
[ 2007 c 305 s 1; 1987 c 214 s 14; 1979 ex.s. c 261 s 18; 1973 1st ex.s. c 208 s 18.]
Effective date—1973 1st ex.s. c 208: See RCW 18.73.910.