We have an old service road that sees a trespasser or two every year, we dropped a tree over it, they dragged it out of the way, strung a piece of barbed wire across it with a sign, they took the wire and sign. I have posts set and a gate will go in this fall. My plan is to put a good cam up high and hidden, with a dummy cam in an obvious spot. I'm hoping they steal the dummy cam for added legal charges, plus when they open it it's going to be full of feces. Haven't decided who's yet.
Somewhat related story. My brother got permission to hunt a piece with the stipulation that he couldn't hunt until the other guy with permission was tagged out. He went over there during the season and was allowed to hunt as the other guy had shot a buck and gone home, but apparently he had also hit a buck he couldn't find. My brother finds a dead buck and a trail camera pointing directly at it. After talking about it we decide previous hunter must have ground checked his 125" 8 pointer and decided to keep hunting, then put his cam on the carcass. My brother went back, snuck the card out, and we checked it at camp. In the dark, the buck wanders into the frame, you can see the gut shot, and beds down in front of the camera to die. No other pictures with a hunter in it. Astronomical odds but that buck chose to die right in front of the camera. He took the card and returned it, never touched the buck.