.... State parks I thought I read are off limits to md unless ok'd by local leo in ohio.....
I checked by Ohio state park's list :
http://parks.ohiodnr.gov/rules And I do not see anything that says "no metal detecting". About the closest I could see, as I alluded to in my earlier post, was an FAQ answer that beaches are ok, but check at land sites, or something to that effect.
And this creates an interesting question: Does "FAQ" constitute law ? Or is it merely "commentary" ? What I mean by "commentary", is for example: You can walk into some cities or counties (or states, etc...) and ask some desk clerk: "Hi. Can I metal detect?". And they might say "no" (because they think you'll harm the sand crabs or earthworms). Yet truth be told, it's nowhere written in the law actually saying "no detecting". Ie.: the "safe answer" routine. So an FAQ is nothing more than a glorified version of this, IMHO. I'm not sure if it constitutes law.
For example, look down the list of the FMDAC's state by state listing. You will see MULTIPLE states that have similar "inquire at each kiosk you come to" type answer. Eh ? And legions of md'rs have assumed that "asking is required". But a closer look at the back-ground evolution of those statements, is that decades ago, when such lists like the FMDAC's were compiled, someone simply inquired at all 50 states asking "what are your rules regarding md'ing?" And then simply compiled the answers into these lists. Some of the states admittedly answered the question by pointing to actual law/rules (if there was one) that might say "no detecting" or "$20 permit" or whatever. Others might have said "no prohibition". But a BUNCH OF OTHERS came back with answers like "with permission" or "inquire at each kiosk", etc... But WHEN YOU LOOK CLOSER at the actual laws, there is NO SUCH REQUIREMENT. It's merely the commentary sent back to the inquirer who was compiling a list.
And the reason for this "safe" answer is easy: Because let's be honest: Some parks might be historically themed sensitive monuments, right ? While the other 99% are just beaches, ball fields, forests , etc..... So rather than split hairs (envisioning geeks with shovels), they just say "ask at each one" or "at the discretion of the ranger on duty" . Sure, the "ranger on duty" can decide you're harming the earthworms. He's more than welcome to come alert me. So too can he decide that flying frisbees "might poke someone's eye out". Or that your boom box music is "too loud". But no one thinks for a moment that he "needs permission" to fly frisbee or listen to a boom box. Even though, yes, it's up to the discretion of a passing ranger.
I'm going to make a separate new thread to see if other forumites equate FAQ's with iron-clad law. You've brought up an interesting question.
As for National forests: Not disallowed. If you need to see the verbiage/text on that, let me know and I'll link you. The only thing that would apply, is ARPA. So don't find anything over 50 yrs. old, and you're looking for "modern change" (or meteorites, etc...). How good is your math ?