I own a quarter section of prime deer hunting land which makes it quite attractive to hunters. At one time we had to post the land, very difficult because of areas of heavy bush or water. Our ministry of natural resources changed the laws and put the onus on the ones who don't own the land to find the boundaries. There are two enforcements we can call, either the police or the ministry officers. What I learned last year was that calling the police meant that with the charge the person/people may be denied access in to Canada. We caught an American who'd set up camp on my land and made threats when told to leave. The police were called, didn't find him that day but he was caught when crossing back into the US. People don't realize that even a minor charge might screw up foreign travel plans.