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Case Basics
Docket No. 
United States
Antoine Jones
Decided By 
(Deputy Solicitor General, Department of Justice, for the petitioner)
(for the respondents)
Facts of the Case 

Antoine Jones was arrested on Oct. 24, 2005, for drug possession after police attached a tracker to Jones's Jeep -- without judicial approval -- and used it to follow him for a month. A jury found Jones not guilty on all charges save for conspiracy, on which point jurors hung. District prosecutors, upset at the loss, re-filed a single count of conspiracy against Jones and his business partner, Lawrence Maynard. Jones owned the "Levels" nightclub in the District of Columbia. Jones and Maynard were then convicted, but a three-judge panel of the U.S. Court of Appeals for the D.C. Circuit ruled that the Supreme Court specifically stated in a 1983 case regarding the use of a beeper to track a suspect that the decision could not be used to justify 24-hour surveillance without a warrant.


Did the warrantless use of a tracking device on Jones's vehicle to monitor its movements on public streets violate Jones' Fourth Amendment rights?

Decision: 9 votes for Jones, 0 vote(s) against
Legal provision: Fourth Amendment

Yes. Justice Antonin Scalia delivered the opinion of the Court. The Court affirmed the judgment of the lower court, and held that the installation of a GPS tracking device on Jones' vehicle, without a warrant, constituted an unlawful search under the Fourth Amendment. The Court rejected the government's argument that there is no reasonable expectation of privacy in a person's movement on public thoroughfares and emphasized that the Fourth Amendment provided some protection for trespass onto personal property.

Justice Sonia Sotomayor wrote a concurring opinion, agreeing that the government had obtained information by usurping Jones’ property and by invading his privacy. However, she further reasoned that the Fourth Amendment was not only concerned with trespasses onto property. She stated that a Fourth Amendment search occurs whenever the government violates a subjective expectation of privacy that society recognizes as reasonable, which is particularly important in an era where physical intrusion is unnecessary to many forms of surveillance.

Justice Samuel Alito concurred in the judgment but criticized the framing of the question in terms of trespass to property. He believed that such a construction of the problem strained the language of the Fourth Amendment and that it would be better to analyze the case by determining whether the Government violated Jones' reasonable expectations of privacy.

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UNITED STATES v. JONES. The Oyez Project at IIT Chicago-Kent College of Law. 29 June 2015. <http://www.oyez.org/cases/2010-2019/2011/2011_10_1259>.
UNITED STATES v. JONES, The Oyez Project at IIT Chicago-Kent College of Law, http://www.oyez.org/cases/2010-2019/2011/2011_10_1259 (last visited June 29, 2015).
"UNITED STATES v. JONES," The Oyez Project at IIT Chicago-Kent College of Law, accessed June 29, 2015, http://www.oyez.org/cases/2010-2019/2011/2011_10_1259.