I love to set the limb line and jugs over the trot-lines and yes we've had issue with people running them for us more than once. As for cutting them, not too bad unless you run them down the bank and bass fisherman catch them but a lot of people will run a line in a heart beat. My suggestion is to bait them at dark and run them at daylight, don't put them where folks will snag em and call the warden if you have to. I put up several messes of catfish every year from lines I set so I know how you feel.