WASHINGTON — When Syed Rizwan Farook and his wife shot 14 people to death in San Bernardino, Calif., in December, law enforcement agents raced to track down one of their best leads: the guns used in the attack. Within hours, they had identified Enrique Marquez Jr., Farook's neighbor, who provided background on the couple and was later indicted on terrorism and firearms charges. Yet despite the urgency of the gun trace — and hundreds of similar searches conducted... (GunPolicy.org)