In a 5-4 decision Friday, the U.S. Supreme Court says police generally need a search warrant if they want to track criminal suspects’ movements by collecting information about where they’ve used t …

In a 5-4 decision Friday, the U.S. Supreme Court says police generally need a search warrant if they want to track criminal suspects’ movements by collecting information about where they’ve used their cellphones. (J. Scott Applewhite/AP)