Are the police free to attach a GPS device to your car to monitor your whereabouts?

Without your knowledge and without a warrant? An appeals court in Madison, Wisconsin says yes.

The idea is that it's not a search or seizure, because it only lets the police see what they would see if they followed you around watching you. Yes, the car might go into a garage and out of public view, but someone standing outside would get the same information, that the car was in the garage until it emerged.