A lot of growers don't get to much sleep come nearing harvest, everything about waiting those last couple final weeks is just stress. Think like a ripper, when would be the easiest time to get those plants, If he knew they were there, of course. Most likely either when you are not home, or after dark. I live in a pretty secluded area, so If my dogs start acting up in the middle of the night, going ballistic, it is most likely either coyotes or people, Ill fire off a couple rounds into the air, if there was any people in the area, the shit was officially scared out of them. You could wrap the top of your fence with barb wire, and the perimeter of your plants lol, I don't think that would be considered booby trapping, so if anybody did try, they would get cut up to hell first. Motion sensor lights work wonders also and a good camera.