The Bureau of Alcohol, Tobacco, Firearms and Explosives concocted a plan to find out what Americans were going to gun shows by using license plate detectors to scan the license plates of cars that were in the parking lots of these events.
El Departamento de Alcohol, Tabaco, Armas y Explosivos se inventó un plan para descubrir que estadounidenses iban a espectáculos de armas usando detectores de  matrículas de autos para escanear las matrículas del aparcamiento  de los espectaculos