(Temporary Link) WASHINGTON -- The Homeland Security Department is considering the use of unmanned aircraft to track drug smugglers, illegal immigrants and terrorists along the porous U.S. border with Mexico, a top official told a Senate panel Tuesday. "There's a lot of interest in this," Robert Bonner, commissioner of the Bureau of Customs and Border Protection, told the homeland security subcommittee. "I think there's potential there." With no human on board, Predators and other remote-controlled aircraft can watch over a potential target for 24 hours or more and fly for hundreds of miles. The aircraft can carry cameras, sensors, communications...