http://www.youtube.com/watch?v=c3rpbqWPrZkI'm not an expert on all the latest technologies but I'm telling you I saw a video of a police helicopter following a fleeing suspect and this technology showed every thing inside every house they flew over. The hottest things were red in the middle followed by yellow and finally blue rings as the coolest. Just before the guy blows his brains out in some guys back yard you can see the man walking around inside the house along with every single incandescent bulb in the house and the heat signature of every appliance.
I think you guys are looking at old outdated technology. Don't let your assumptions bite you in the ass.
Watch the video again - you can't see anything inside any house in my opinion... but there's the video to make up your own mind.