XT18000, just curious: what is the source of your information? Because I have heard of people asking about various carribean, mexican, south american, etc... beach areas, and being told "no" by whomever consulate or lawyer type they asked (or police, or concierge or tour guide, etc...). But then they get to their destination, and find no shortage of md'rs on the beach

I guess it depends on who you ask, how you couch your question, etc... Because perhaps they're couching their answer in terms of shipwreck salvor laws, pyramaid raiding, exporting gold bars?
Fisher, one time, even reported to it's readers in one of its periodicals, in response to one of their readers writing in a letter to the editor, that metal detecting in all of mexico, was illegal. How did they get this answer? They asked! doh

The odd thing is, Fisher has dealers down in Mexico, and detectors are a common site on tourist beaches. Ie.: any rule that Fisher must've received back from their legal sources, obviously had nothing to do with casual hobbyist stuff, but more likely something to do with historical monuments, etc... (no different than the USA).
So that's why I ask where your info came from.