be careful, cause they might have cameras, but if not i would steal something of theres to the same sort of value, if you know someone who steals cars, jack it, cause if they dont call the police then you know they have your plants cause overwise they would do so, and get a greenhouse with a lockable door, or build a biodome with a lockable door and get the internet webcam set up. also another thing would be put a shit load of die or something thats gonna cost them a load to drain the pool (this can be done more then once) then when its drained chuck a loads of rocks in the that will break the fucking tiles up, but be commited to making sure the next 6months are hell on earth cause im guessing thats how long you have been growing. so its only fair if they want to take 6months worth then make there life hell to deture them from doing so again. and get a set up to make sure it doesnt happen again. also if you know anyone with dogs ask the owner for asmuch dog shit (if they have a large breed dog) there will be plenty and smear it all over the handles of their stuff.