Just heard that colored halos and other forward facing colored lights will become illegal in Tennessee effective 1/1. Only white and amber will be permitted. Hummm... just FYI.
Laws vary considerably from state to state. White and amber seem to be OK most all areas. One friend has blue/red flashing on front of his Slingshot....his ID says 'Chief of Police' so he is probably not going to have a problem.
Its always been that way here in PA amber or white front....... amber to the sides and red facing rear although its not enforced very well...........My guess is if you get pulled over for something else and the cop feels like piling some more $$$$ on the ticket he'll get you for the lights