Actually yes, in MN they can. Our CO's need no permission to enter private property but do need a warrant to enter your house. Less restrictions on them could be a good thing since we all want to protect our natural resources but on the other hand if they waste their time enforcing stupid rules that also sucks. I fully understand the need for good laws and good enforcement. I really don't think they would waste their time going after me on my pond cause they are generally pretty good guys. But if they came onto my property for some other reason and saw me fishing they could ask for my license. If I didn't have one I'd probably just get a warning depending on the guys mood. Believe it or not they even had the power to search cars, boats and ice fishing houses without permission or a warrant up until a couple of years ago when a lawyer decided to push the issue.