Yes, they have. I worked as a USFS fire suppression aid (cleaned campgrounds, collected fees, painted stuff....no fires) right out of high school. That was 1972. People would pay the fees and leave their trailers for a week. Or not pay their fees. I ticketed one guy who said he was a veteran of WWII and he was not gonna pay no G*DDamn campground fee and he wasn't By G*D pay any ticket. The ticket went to the magistrate in Billings who promptly dismissed it. I found out later that he did so for any such citation. Not worth his time, evidently.