It's the law. Take it all, including guts.
It is permissible to salvage and transport a deer or elk that is accidentally killed by a motor vehicle collision except for any deer killed by a motor vehicle collision in Clark, Cowlitz, and Wahkiakum counties.
A salvage permit must be obtained from the department within 24 hours of taking possession of the animal. Permits may be obtained on the department's website or at department regional offices.
Big game licenses and tags cannot be used for the purpose of salvaging motor vehicle-killed deer or elk.
The entire carcass, including entrails, of the animal must be removed from the road right of way.
Any meat an individual deems unfit for human consumption or unusable animal parts must be disposed of pursuant to WAC 246-203-121
http://apps.leg.wa.gov/WAC/default.aspx?cite=246-203-121. Individuals salvaging and consuming this meat do so at their own risk. The department makes no guarantee as to the fitness for consumption of deer or elk collected under a salvage permit. (See Wild Game Meat Food Safety.)
An individual may not kill an injured or wounded animal for the purpose of salvage. Only a law enforcement officer or individuals or entities authorized by the department may euthanize an animal injured in a motor vehicle collision, whether or not the animal is taken for salvage.
Possession of wildlife in violation of subsection (4) is punishable under RCW 77.15.750.