Hope that ranger will be looking for blood and hair on the bumper and if you could see any through the back window. Being a cop like you, and as a hunter, its no secret you that you can NEVER get rid of ALL of it.
If you could go back to where you saw him and find some blood to match it with, it could nail him. Sounds like a lot of ado about nothing to some, but here in KS, they'd do all of that to nail a poacher and to make a case. Last year, we had a guy run up on some poachers in the north central part of the state and the poacher tried to kill the old farmer who was stopping to see if they had car trouble. Stabbed him several times with the same knife he was cutting the head off with and nearly cut off the old man's nose if I remember right. Poachers usually have other criminal records as well and can be dangerous. But in this case, it is probably good for him he didn't stick around. :D