The police need warrants needed to put GPS devices on cars.

This wraps up another case we first discussed in the fall.

From the Washington Post:

The Supreme Court ruled unanimously Monday that police must obtain a search warrant before using a GPS device to track criminal suspects. But the justices left for another day larger questions about how technology has altered a person’s expectation of privacy.

Justice Antonin Scalia wrote that the government needed a valid warrant before attaching a GPS device to the Jeep used by D.C. drug kingpin Antoine Jones, who was convicted in part because police tracked his movements on public roads for 28 days.

“We hold 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’s protection against unreasonable searches and seizures, Scalia wrote.

More from ScotusBlog, including links to all relevant court documents.