Ok, I know that the state of missouri has a website that you can go to, to find out the state laws. I dont know if your state has that or not, but in the state of missouri it is against the law for anyone to drive with any kind of light on ( such as a dome light) while driving. This is on the inside of the car. Now as for neons under the car, no that is not against the law, only certain colors like red and blue. Green I am not sure about. But then again the state of missouri is anal about anything that has to do with modifying of any car. Like for instance, you can not have really dark tint and you have to have a permit of certain shades of tint. But a lot of times they will not bother you about any of it. That is until you have to get you car inspected to get the plates renewed.