In a decision that defines how the Fourth Amendment applies to information collected in the digital age, the Supreme Court today held that police must use a warrant to obtain from a cell phone company records that detail the location and movements of a cell phone user.  The opinion in Carpenter v. United States limits the application of the third-party doctrine, holding that a warrant is required when an individual “has a legitimate privacy interest in records held by a third party.”

The 5-4 decision, written by Chief Justice John Roberts, emphasizes the sensitivity of cell phone location information, which the Court described as “deeply revealing” because of its “depth, breadth, and comprehensive reach, and the inescapable and automatic nature of its collection.”  Given its nature, “the fact that such information is gathered by a third party does not make it any less deserving of Fourth Amendment protection,” the Court held.
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