About 55,000 guns found in Mexico were traced back to the United States between 2006 and 2010, according to Ken Melson, director of the Bureau of Alcohol Tobacco and Firearms (ATF). Melson said during the same time period, agents in the U.S. seized 10,000 guns headed for Mexico. That's less than a fifth of the U.S. guns confiscated in Mexico. Melson said a lack of agents means many investigative leads fall by the wayside. He said just 600 agents inspect the nation's... (GunPolicy.org)