AGAIN, my point about the cfl, and the window sill is that even hobby plants are 'illegal', and by letter of the law in most places, ppl typically grow enough plants under a 400W hid to reach the next tier of possible charges/penalties.. My point all along is that unless extreme, hydro consumption isn't a good determining factor for LEO's.. If they see HPS light seeping through a crack its hard for them to know if its a 150W or a few kW.. That means its worth checking out, and once they open the can of worms, its open.. If you have 9 small plants under a 400W, they'll charge you to the maximum extent that the evidence warrants.. Your lawyer may be able to argue it down, but thats after the fact.. If your lawyer fails though cultivation with intent to traffic is a DAMN hefty charge in some places.. You're probably going to wish you had a few kW at that point, because you might end up just as deep for the 400W..
You need to understand the difference between the letter of the law, and the spirit of the law..
What those cops did was a good deterrent in the spirit of the law.. Obviously they just wanted to make a point.. The cup/plant was blatantly visible.. That constitutes cause.. A 'criminal offence' in 'plain sight' is actionable by police..
Lastly, location, location, location!! But even if you're in a place like BC, you're still going to be better off minding your P's and Q's..