A family friend of ours found a pile of apples on his property last year. He thinks the neighbors are baiting animals on his property just across the property line. What should he do about this?

There are no apple trees anywhere near where he found the pile of apples. They appeared to have been placed there, where the neighbors have a clear shooting lane onto his property. They did not have hunting permission on his land, either. He took all the apples and got rid of them. He is concerned that they may do it again, and he does not want anyone to think that it is him doing it, since the apples are on his land. I consider this to be blatantly disrespectful, not only to the law, being these laws are in place for a reason, but to our friend as a landowner. I should note however, that this was done during an open legal season for deer, but we can't be sure if that would have been the only thing they would have taken a shot at.