If you carried a cell phone past the wrong street corner at the wrong moment, police could already have your movements, your digital trail, and your identity—without ever suspecting you of a crime.

That is the reality of geofence warrants, a powerful surveillance tool whose use by police is now being challenged before the U.S. Supreme Court.

Warning that geofence warrants constitute digital fishing expeditions that force millions of innocent Americans to prove they’re not suspects, The Rutherford Institute is urging the Supreme Court to hold that geofence warrants are unconstitutional general warrants—an abuse of power the Founders sought to prohibit through the Fourth Amendment. Historically, general warrants gave government agents sweeping authority to search wherever they pleased, without probable cause or particularized suspicion limited to........

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