https://app.leg.wa.gov/rcw/default.aspx?cite=77.15.460
4c You can shoot from a vehicle if the engine is off and you are not parked on or beside the maintained portion of a public road 
am I reading that right
You have to read further into the WAC:
https://apps.leg.wa.gov/wac/default.aspx?cite=220-413-140(7) It is unlawful for a hunter with a disability to possess a loaded firearm in a motor vehicle, or shoot from a motor vehicle, unless the hunter with a disability has been issued a special use permit from the department, and:
(a) The vehicle is stopped, the vehicle is removed from the maintained portion of the roadway, and the motor is turned off; and
(b)
A valid blue disabled hunter "shooting from a vehicle" identification placard must be displayed and visible.
Part "B" is what I was reffering to when I said they tightened up the requirements.
You can be granted Disability status but still not be able to shoot from a vehicle.
