Does anyone know where I can go to get a list of rules and regulations for modifications (i.e. underbody lights or interior lighting) to vehicles for federal and/or individual states? I have gone to the Arizona state sight and looked up the information there but they do not have a specific law pertaining to this subject. From what I could tell they do not have any laws pertaining to the color of headlamps either but then I may not be looking in the correct spot. I would call my local police station but I am at work now and can not call them. Thanks in advance for any answers.