New submitter robkeeney writes "Legislators in several states are working on laws that would require certain gun manufacturers to implement 'microstamping' to help law enforcement solve gun crimes. 'Lasers engrave a unique microscopic numeric code on the tip of a gun’s firing pin and breech face. When the gun is fired, the pressure transfers markings to the shell casing and the primer. By reading the code imprinted on casings found at a crime scene, police officers can identify the gun and track it to the purchaser, even when the weapon is not recovered.' As with any gun-related legislation, many people oppose these new laws. In California, a law passed in 2007 requires that when microstamping (which is easily defeat-able) is no longer patent encumbered, all new guns in CA must use it. To fight it, an organization called the Calguns Foundation paid a fee to extend the patent in order to prevent the law from going into effect."