Here in Arizona it is legal if you are the car that hit the animal. A few years ago, I saw a deer get hit a couple cars ahead of me, there was actually a police officer a few cars behind me, the accident driver, the officer, and I stopped, the deer was alive but terminal, the officer dispatched the deer, the driving victim got a tag from the officer and then signed it over to me. You need the paperwork straight if you are taking the animal to a proscessor. I did all the butchering myself. Easy meat in the freezer.