I'm no professional but I would dare venture that most of your problem evolves around less then 4 people that have figured out the place, and probably live close enough to sneak in on ft. I may be wrong but I'd bet you catch one of them and prosecute him your problem will be mostly solved. in today's technology age with real time cell cameras and all, most individuals realize the implications of such actions, just a few stupid crackheads that don't care about an arrest record.

All the really good ideas I've ever had came to me while I was milking a cow.