Although President Bush and Homeland Security Secretary Michael Chertoff have touted the use of unmanned aerial vehicles for border security, recent problems with the technology indicate that UAVs face major challenges in their conversion to a domestic surveillance role, according to officials and budget documents. In a speech to the nation in May, Bush said UAVs will be used to prevent illegal crossings into the United States. But the Border Patrol has not flown a UAV along the southern border since its only Predator B drone was destroyed in a crash outside of Nogales, Ariz., in late April, an agency spokesman said. Full Story