Besides the thread is about Federal Land, ....
Even on "federal land", no one back-in-the-day wondered: "Is it allowed?". It never occurred to any of us that we SHOULD worry.
In fact, humorously, I recall , that in 1980, a friend of mine was detecting at Pinnacles National Monument (at some 1930's campgrounds there) . That's an NPS park. A ranger came out and started spouting at him. My friend ......... who was not one to back down ....... challenged the guy to: "Show me any such rule". The ranger stormed off. Came back 10 minutes later with some papers in his hand, and proceeded to show them to my friend.
The best my friend could make of the wording, that he was being shown, was something about
Indian stuff. So he told the guy "that doesn't apply to me, since the Indians had no refined metals". As it turns out, he was about to call it a day anyhow, so he told the ranger: " I'm leaving now, but I'll be back tomorrow at noon. And I have every intention of md'ing again. If you think it's not allowed, you're welcome to come try to kick me out".
The next day at noon, he resumed md'ing. No one ever came out and said anything to him.
Now ...... in retrospect (nearly 40 yrs. later) I realize what the ranger was probably showing him, was the 1979 version (which .... in 1980, was still "hot off the press) version of ARPA. And in retrospect, my friend was probably in the wrong to be on NPS (as we all know so well now).
But the reason I point out the story is to illustrate how it was a BIZARRE CONCEPT to get a "scram" . From a fairly innocuous mundane public campground. Such that ...... we simply didn't believe anyone that said "you can't be doing that". And rarely did we ever get any "scrams" .
See how times have changed ?