As far as Ohio is concerned, you're okay as long as they're not on. Just having them won't get you stopped, but turning them on will. So if they're installed from the previous owner, or if you put them on, really won't matter as long as you're not using them on/near the roadway.Does it make any difference if police lights were previously installed in a car? Heard it's just a no no to use them, but they really can't say anything if the lights are installed but not in use.. ???