"Where that authoritatively written?"
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Read the signs in my #44.
Texas is a strong Property Rights State. I could post such signs at the entrance to my long driveway, if I wished -- and they would carry the full force of Texas trespass law. But, I won't so insult my friends and relatives -- who know they're welcome on my place (and are not trespassing)!
So -- I posted a simple, "No Trespassing" sign (which bears the same force of Texas law) for the edification of solicitors, Jehovah's Witnesses, and such...
TXnMA
Texas rules :)