The Supreme Court ruled unanimously Monday that law enforcement authorities need a probable-cause warrant from a judge to affix a GPS device to a vehicle and monitor its every move.
The decision (.pdf) in what is arguably the biggest Fourth Amendment case in the computer age, rejected the Obama administration’s position. The government had told the high court that it could even affix GPS devices on the vehicles of all members of the Supreme Court, without a warrant.
“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,’” Justice Antonin Scalia wrote.
via Wired, continued here.