Parents and teachers are raising concerns about violence at Columbus City Schools, with more than 850 police runs to district middle and high schools in less than three years. “These kids are no joke. This isn’t like minor disruption,” an elementary school music teacher told NBC4 Investigates. “This is foul-mouthed, this is punching, this is threats, this is hitting. I don’t go on the playground for fifth and sixth-grade recess. I don’t do it because there’s too many fights.”