I live in FL for 6 yrs now, and I have yet to see cops doing anything on the beach (besides babe watching
)
I had a similar situation to what you describe.
My parents were in Kawaii (one of the Hawaiian for those who dont know) like they go every year. Since I have a reef tank, Mom thought she would grab some of the 'rocks' (coral skeletons) off the beach and send them to me.
So she shipped me the rocks, which were completely dried out.
(If they arent dry, I would let them dry out to prevent the introduction of parasites into your tank. I wouldnt introduce anything 'live' IMO )
I then Boiled them in water (yep, on my stove
), let them soak overnight, boiled them again, and then let them completely dry out. After this I threw them in the sump, they started to grow stuff so I placed them in the DT.
I dont know if this was the right thing to do- as far as cleaning the rock, but Ive had no problems.... other than Mom who keeps sending me 'stuff for my tank' lol. Hey its not THAT bad I guess.
I wouldnt worry about the cops unless you are hauling away a pickup full of rocks. If its just a few peices, thats just like a souvenier- like a bucket of shells, how many kids take POUNDS of that home?
Dont destroy the natural reef/habitat. Washups shouldnt effect anything in the amount you are taking.