George, here's what I was reading:
http://www.southcarolinaparks.com/files/State%20Parks%20Files/State%20Parks%20Files/Metal%20Detection%20Policy.pdf
And that exact same text, is what comes up when you click on the FMDAC's state by state list (when you click on the name of the state for expanded version of how they came up with their "yes" or "no"). And now I see that this wasn't only simply an answer given to someone who wrote in (like someone compiling a list such as that). But instead, is on SC's actual state park web-site. So I stand corrected.
If you go down that FMDAC's website's 50 states, you will indeed find some that are written in the context of someone there only answering a letter sent to them. So, for example, it might say " with permission". And then they back that up with something about "disturbing wildlife", etc.... huh ? In other words, you have found someone who interprets it as a "no" or "with permission", but no where is it actually specific that SAYS such a thing. California is an example of that. So when I got to the bottom of the SC thing, and saw their referencing (ie.: backing up what they'd just said as a "policy" ) to be: Section 51-30-70, then it appeared to me that everything ABOVE that was merely an interpretation (extrapilation) of that.
And I would stand by that , if it weren't in actual park's verbage (as a written policy), versus an answer someone got because they went in and asked "can I?".
There are SCORES of places where someone sent a letter, or went in and asked, and got told "no", or "yes but you can't dig", or "turn in everything, even your pennies" or "with permission", etc.... And, heck, that answer may even come back in writing to you. Yet when you look deeper, it is nowhere actually written down like that. So does that make it "law" from then on out, even if no one ever had a problem detecting there ? Could those be cases of "no one cared till you asked" ?
But in this case, it's actually on the SC website (not a silly answer given to someone compiling a state by state list). So I do stand corrected.
Question for you George: Assuming someone got permission then to detect a beach there 10 yrs. ago (because it's non-historic, blah blah blah). Then does that apply to other md'rs who come after him ? So like if your buddy "has permission" to detect a beach, can you join him the next day (or year, or decade, etc...)? Or does each individual person have to ask permission for the exact same location, that had previously always been yes to those who asked before that , at that spot ?