I would have to ask how they would know that you are hunbting on your land without first entering it? If they do enter without permission, they would be trespassing, IMHO. They can not just walk around on your land, hoping to find you doing something that may be illegal. Regardless, unless they actually see a crime being commited, I would think they would need a warrant to enter, unless permission is given. I will not give them that permission, but to each his own.
The DNR seems to think that they have alot more octane than they probably do. I also think that many, many people are fed up with thier antics. I know they are fed up where I live, and would loove to see them neutered and toned down a bit.