United States v. Antoine Jones

United States v. Jones was a 2012 decision by the United States Supreme Court regarding government's installation and prolonged use of a Global Positioning System tracking device.

Background
Without a warrant, the government installed a GPS device on the suspect's car and continuously monitored that vehicle for 28 days. Although the Court asked parties to address whether "the warrantless use of a tracking device on respondent's vehicle to monitor its movements on public streets violated the Fourth Amendment," the Court's ruling was narrower than its question presented.

Result
On 23 January 2012, the Supreme Court unanimously held that "the Government's installation of a GPS device on a target's vehicle, and its use of that device to monitor the vehicle's movements, constitutes a 'search'" under the Fourth Amendment. The court did not address whether such a search would be unreasonable and therefore a violation of the Fourth Amendment.