California is the latest and largest state to require its schools to restrict or ban cellphone use in the classroom. Gov. Gavin Newsom (D-CA) signed the Phone-Free School Act on Monday, which requires every school in the Golden State to implement a policy limiting cellphone use by July 1,

A growing list of states and schools are now banning or restricting cell phones. Johns Hopkins experts Carol Vidal and Annette Anderson explain the research and weigh in on the controversial policies.