Breaking Down Chatrie v. US, the Supreme Court’s Landmark Fourth Amendment Decision
Last week, the Supreme Court issued its first major Fourth Amendment case in six years: Chatrie v. United States . Chatrie is a massive victory for digital privacy. It holds that geofence searches, which use cellphone data to track all cellphone users in a certain area at a certain time, are Fourth Amendment searches requiring probable cause and a warrant. It sharply limits the “third-party doctrine,” which held that data disclosed to a third party service provider lost all Fourth Amendment protection and could be obtained by the government without a warrant or cause. More than that, Chatrie definitively establishes that Fourth Amendment law in the digital era will be appropriate to that era, and not anchored to traditional property concepts or distant analogies to non-digital contexts. The future of Fourth Amendment law has never been brighter. The Chatrie case involved the investigation of a bank robbery. On May 20, 2019, a man wearing a fisherman’s hat and a traffic vest robbed a...