Originally Posted by Walter S

Not that I know, but could it be that both of you are sort of generally correct in a certain way? I could see being guilty of trespassing if you enter an area that's posted. But I could see having a law that's sensitive to differences between posted and unposted areas, by saying that when it's unposted you're not guilty unless you stay after being asked to leave.

It would make sense to me. Is it the law anywhere? I'm not sure.