The Supreme Court has declared it unconstitutional for police to use GPS tracking on a suspect’s vehicle without a warrant. The ruling was unanimous, with the majority citing such use of technology without a warrant as a violation of the suspect’s Fourth Amendment rights. The Wall Street Journal reports this excerpt from Justice Scalia’s opinion for the Court:

"The Government physically occupied private property for the purpose of obtaining information. We have no doubt that such a physical intrusion would have been considered a 'search' within the meaning of the Fourth Amendment when it was adopted," Justice Scalia wrote, joined by Chief Justice John Roberts and Justices Anthony Kennedy, Clarence Thomas and Sonia Sotomayor.