I was watching one of those Alaskan law shows and they did bust someone for a grow op because of frozen condensation that had formed a huge icecicle that hung from just below the gutters all the way to the ground. All it takes is for a cop to notice something different and then start looking more closely and then they are kicking your door in if your shit doesnt look like your neighbors fix it so it does better safe than sorry...Its a consideration. I've heard of people getting caught in the North when all the other neighbors had snow on their rooftops except for the grow house. Of course, they were doing a huge set up, but nonetheless, any abnormalities YOU can see, means technically anybody can see too.