Drug violence along the Mexican border with the United States has dropped since Mexican President Felipe Calderon ordered troops to a small town on the Mexican side of the border, U.S. Homeland Security Secretary Janet Napolitano said on Wednesday. “Yes we have seen a reduction in violence,” she said during testimony before the Senate Judiciary Committee hearing. Calderon ordered thousands of military personnel into Ciudad Juarez, a small border town wracked by violence between rival drug cartels.