ORIGINAL: furgitter
Shoot the dirt bag with a paintball gun and you may have lead flying your way! Get someone to look after your land while you work. Give him some hunting rights in return.
That's what I was thinking. Have someone watch while you are not there, with a camera, for evidence. If he is not a hunter, pay him as much as you can afford, or maybe pay him in venison. Of course it would be difficult to find someone to do this for you. It's hard to catch an experienced poacher, even by a warden. There are just too many A-holes in this world.