Im with MH they could be growin tomatoes for all they know or a million other reasons for a heat bloom.I read another post on another board from a guy in the carolinas and he was followed from a hydro store BUT that was not enough for a warrant so they surveiled his home and went through his trash after he put it out and found leaves he had cleaned off his plants,that got them their warrant and they raided his home and arrested his wife and eventually him as he was working out of town.The stupid thing is that he was only growing like 3 or 4 plants and they werent doing very well as he was working out of town alot.NEVER THROW ANYTHING IN YOUR TRASH,NEVER!!Dont give them the ammo they need to get a search warrant because seeing you at the hydro shop is not enough on its own to get one,which is not to say they wont just plant something but dont bone yourself!
Honestly their are SO MANY hydro stores and growers now it would be impossible to try and track them all,Each hydro store(and their is one on every corner almost)has to have alot(100-200?) of customers just to stay in business,could you imagine if they FLIR'ed denver or los angeles?the whole damn place would be glowing,lol.