There was a guy in the states that made how to hunt videos on bow hunting. He was a supposed expert on bow hunting elk. In one of the video's he killed this incredible huge Elk from a tree stand. However it turned out that the Elk was on Yellowstone National Park. The Elk was well known and was not afraid of people, it use to walk up to them. The park service recognized the area he was hunting and the elk he killed fined the crap out of him. Me I think he should have done some jail time ... Sound pretty similar to your situation except some jerk had permission

Good grief