With drug violence raging in Mexico, the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives says a surge in federal agents in Arizona has helped the United States recover about 1,300 firearms in the last 100 days, many of them believed bound for Mexico. Federal law enforcement officials say the success is prompting the ATF to roll out similar techniques in seven additional cities believed to be hotbeds for gun traffickers. The current operation involved the deployment of a Project Gun Runner Impact Team (GRIT) to combat the deadly flow of weapons from the United States to Mexico's ongoing drug...