Lifeline or distraction? Shooting reignites debate over phones in schools  NBC NewsAs school districts consider phone lockups, here’s how it works during emergencies in Marietta  WSB AtlantaDeadly Georgia school shooting puts Ohio law limiting classroom cell phone use in spotlight  WLWT CincinnatiParents concerned over Tampa Bay school cellphone policies after Georgia shooting  WFLA‘Georgia shooting shows why kids need phones in school’  The Times