Jason, Thanx for agreeing with me "normally"

you are absolutely right. Anytime such a "decision" goes to pass in front of an archie (who as you say, is on the payrolls of various govt. agencies), then sure, they say "no". Because as you say, they are innately at odds with the idea of our hobby. And then we md'rs say "
durned those archies anyhow", right? But I bet you 99% of the time, the reason it ever reached that archie's desk, for his in-put
TO BEGIN WITH, was the "pressing issue" that makes the rounds to them, to begin with. Ie.: Someone asks (maybe not NOW, but perhaps 10, or 20 yrs. ago, etc...). Thus the question needs to go to various channels of approval, and then yes, the archies say "no". I can give you MANY examples of this, where ...... sure ......an archie said "no". But when you look deeper, to see why it was even on the archie's desk for his say-so, it is just as I've said. If you doubt me, I'll give you case examples of this happening time and again, at various govt. levels, where the chain reaction was/is documented.
OBN, you say: " .....
you cannot significantly impact the water bottoms and you cannot use any mechanical equipment. You would need a permit to do so from this agency. " Well gee, I don't think digging with a sandscoop "significantly impacts" anything. And ... no .... I'm not using "mechanical equipment" to dig either. So why, therefore, would we need a "permit" from that agency?
Big-scoop, you say: "
Having that conclusive answer beforehand is what prevents all of this non-sense" Why can't the "
conclusive answer" be from a person looking it up for themselves? And if the law is silent on the issue (nothing specifically saying "no metal detectors"), then presto, it must not be dis-allowed then? Why can't
that be "conclusive"? For example, if I see no rules on the books forbidding the flying of frisbees, I'm going to assume that ... therefore ... flying frisbees is not disallowed. Can that stop a cop from coming up and saying that "frisbee flying is a dangerous nuisance" (might poke someone's eye out), and writing me a ticket? SURE! But does that therefore mean I stop in at all parks before arriving and asking if I can fly frisbees? NO!
And to say that asking ahead of time prevents the nonsense, be aware that it can also CAUSE nonsense to START, where no one ever had a problem before. There are multiple real-life examples of this, from city and up to state scale, that I can give, where no one ever had a problem, till people went "seeking clarification".