In Montana, all you need is small amount of blood or anything that has DNA!! It's a little easier to find your arrow than a bullet but as long as you have something FWP will do a test!!! Before the wolves killed off most of the Yellowstone herd, there were many stories of guys hunting with a tag, knife, and running shoes during the damage hunts! Still happens today though so get as much evidence as you can if you have to leave!! Better yet, grab a quarter or back straps and you are covered! I haven't heard of anyone ballsy enough to mess with a cut up animal!! Sad fact about leaving a partial animal though is leave the horns!! I have seen a hunter get a ration of shiznit for leaving the meat and taking the head out first from a game warden!!