What should I do about these teenagers who keep tresping on my property?

I live on a farm and these local teens keep coming onto my property at night and leaving beer cans and used condoms all over the place and I have to clean it up. I put up No Tresping signs but it doesn't stop them. Just last night I placed several dozen bear traps in the area where I think they are congregating and covered the traps with leaves so as to hide them. If I wake up in the morning and find one of these hooligans caught in a trap I am wondering what I can do with them. As far as I see it, I have the right to protect my property. I have an old chicken shack that I could store them in for a few days to teach 'em a lesson. If they don't learn from that I figure I can just set up camp a few hundred yards from where I set the bear traps with my hunting rifle. Any thoughts?