In Britain, a helicopter over flew a house with an infrared camera and detected that it was "too hot", so naturally they suspected that the house was a "grow house" for marijuana:

But when embarrassed officers searched Mrs Huseyin's house they found the glowing effect was caused simply by large amounts of heat escaping through the roof.

Mrs Huseyin, who has been a PCSO since March 2007, said: "I was absolutely gobsmacked when I realised the police had come to search my house. When I saw the squad car I thought it was colleagues just popping in for a cup of tea.

"I saw the police car pull up and I knew the sergeant. She recognized me when I answered the door. She was shocked and said three times, 'This is your house?'

"They showed me the footage from the helicopter and I couldn't believe it. They said if I hadn't been in they would have broken the door down to get in."

The Cambridgeshire Police helicopter had been flying over on an unrelated job when its infra-red camera picked up Mrs Huseyin's glowing home.

That's all it takes these days.  No abnormal activity.  No complaints from the neighbors.  Just a heat signature that is "too hot" and boom, you are being searched.  What surprises me the most, given that this is in the UK after all, is that they didn't cite her for having a home with substandard insulation.  Isn't that a crime against the environment... almost worse than growing drugs?

Via Boing Boing.