G, my understanding (correct me if I'm wrong) is that if the substrate is larger than a certain size (IIRC 1/2"X1/2") then it is not legal to "export from Florida". Haiti OTOH is different (and we know a little about that source and his permits), you can have a fist sized rock and it's OK. That's where it gets dicey, how do you tell... At a certain point, who's to say?
Yep, here we go with the same discussion (on and on), what a PITA gray area is, right? Things get mixed in with other things, garbageland, kittyland love center, Ricky's used shit, piss jugs, it all becomes a blurr....