In a unanimous and precedent-setting ruling, the Supreme Court said Monday that police must get a search warrant before using GPS technology to track criminal suspects.

The case in question involved Washington, D.C., nightclub owner Antoine Jones who was tracked to a suburban house used to stash money and drugs. He was sentenced to life in prison before the appeals court overturned the conviction.

Associate Justice Antonin Scalia said that the government’s installation of a GPS device, and its use to monitor the vehicle’s movements, constitutes a search, meaning that a warrant is required.

“By attaching the device to the Jeep” that Jones was using, “officers encroached on a protected area,” Scalia wrote.

All nine justices agreed that the placement of the GPS on the Jeep violated the Fourth Amendment’s protection against unreasonable search and seizure.

“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,’” Scalia wrote.

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