Can non-law enforcement persons in Louisiana use a blue police light in a vehicle?

Answer 1

D. No person shall sell a dashboard, hood, vehicle front grill, or vehicle roof mounted emergency light that emits a blue or red glow, or that emits a glow in any combination of the colors red, white, and blue, to any person who is not a peace officer, a firefighter, or a person employed in the performance of emergency or public utility services. No person shall possess such an emergency light except peace officers, firefighters, public utility, and emergency personnel. .... See: http://www.legis.state.la.us/lss_doc/lss_house/RS%5C32%5CDoc%2088269.html