According to the Chicago Tribune, on May 7, 2009, a three-judge panel of Wisconsin Court of Appeals unanimously ruled that police "can attach GPS to cars to secretly track anybody’s movements without obtaining search warrants" without violating the Fourth Amendment. The court’s opinion in State v. Sveum can be found here. The defendant Sveum was under investigation for stalking when the police obtained a warrant to secretly place a GPS device on his car while it was parked in the his driveway. … More