Students in Florida, Indiana and Ohio returned to the classroom this fall with new restrictions on cellphones. It's part of a crackdown on screen time and social media by school administrators and political leaders who fear the technology is harmful to students' learning and mental health. On POLITICO Tech, Stanford professor and former schoolteacher Antero Garcia joins host Steven Overly to explain why he thinks such bans are bad policy — and bound to fail. Learn more about your ad choices. Visit megaphone.fm/adchoices