Attaching a GPS device to a vehicle and then using the device to monitor the vehicle's movements constitutes a search under the Fourth Amendment. Decided January 23, 2012 (argued November 8, 2011). Opinion of the Court: Antonin Scalia → go there Applied: the Fourth Amendment → go there Topic: Fourth Amendment rights. United States v. Jones, 565 U.S. 400 (2012), was a landmark United States Supreme Court case in which the court held that installing a Global Positioning System (GPS) tracking device on a vehicle and using the device to monitor the vehicle's movements constitutes a search under the Fourth Amendment. Wiki link