Nah. This is MUCH too small of a hobby, to bother with it. I mean, I bet in a city of 100,000, there's probably an average of only 5 or 8 hardcore hunters. Anyone else in that # of people just let it sit in the closet, or only pull it out when something earth-shaking or easy or obvious comes along.
There's just not enough hobbyists to merit any such thing. This is illustrated in the humourous encounters you often read about, of persons walking into city halls, park's dept's, etc... to ask if they can detect their city's parks (as if they needed to, but .... oh well). The person fielding their question often has a response something like this: You want to do what? What's that? Showing that it is more a less still an oddity, something people usually don't see or pay attention to, or even give thought to it.
Like, when you pass the average park or beach, you rarely see another md'r, right? And if WE tend to see them, it's only because it catches our eye because it's our hobby. But realistically, it's not a wide-spread hobby.
And as such, it's very rare for any city, or state, to have any sort of permit system. To create a bureuacracy to make for some sort of paperwork, would need multiple thousands of paying persons *just* to make it worthwhile, to even have any sort of thing, to begin with. Thus you rarely see any city or county or state do such a thing. Thus there certainly won't be anything national, if that's what you meant.