There's a RCW on spray devices. It's almost like our preemption for firearms except, that it doesn't say anything about limiting, only possessing.
Personal protection spray devices.
Either way holmes is not too intelligent and deserves a few kind words of mine. I got my girl a crap load of pepper spray, different sizes for different locations for different uses!(2) No town, city, county, special purpose district, quasi-municipal corporation or other unit of government may prohibit a person eighteen years old or older,.....from purchasing or possessing a personal protection spray device or from using such a device in a manner consistent with the authorized use of force under RCW 9A.16.020.