Fluorescent green license plates: Ohio could use them as a scarlet letter to mark sex offenders and to warn parents and children of potential danger. A bill before the Ohio Senate would require registered sex offenders to drive with special license plates. Proponents say it will prevent them using their vehicles to lure children inside and stop them from trolling neighborhoods for victims. Others say special plates and sex offender registries that limit where predators can live have little effect. The real offenders aren't the strangers on the street. They are family, friends and acquaintances known to the victims. What works and what doesn't Friday morning on The Sound of Ideas.St. Sen. Kevin Coughlin; Meghan O’Brien, Cleveland Rape Crisis Center