What are the laws for after market - fog / driving lights?

[boulderhummer]

depends on your state H3..here in PA, the roof lights must be covered according to our vehicle inspection laws, however I do not know any cops that would cite that violation. fog lights are okay, but they must be functional and can't obstruct any stock component of the vehicle.
can't use roof lights for driving in PA.
these laws vary from state to state,,,you could call your local police department to see what your area allows.