Usually the debate about smartphones at school is about whether they are a distraction or a tool for learning, but the recent school shooting in Parkland, Florida has sparked some debate about whether students are made more -- or less -- safe by carrying cellphones at school. Some say students with the devices can alert others that they are safe when getting to and from school or during an emergency, but others argue that phones can make students less safe during a crisis by distracting them from following directions by teachers or first responders, giving away their location to an assailant, or jamming up communications interfering with those coming to help them.