The Supreme Court ruled Monday that the police do not have the right to place a GPS monitoring device on a suspect’s car without a probable-cause warrant from a judge. The decision was unanimous in that matter. “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 for the majority. The case was concerning suspected drug dealer Antoine Jones, whose car the Washington, D.C., police tracked for a month using GPS. The justices threw out the life sentence against Jones.