Unmanned Border Crossing

December 11, 2011 - 5:05 PM
In this Oct. 31, 2011 photo, work is underway in Big Bend National Park, Texas, on a planned remotely-operated port of entry at the Rio Grande. It would be the first of its kind on the U.S.-Mexico border and provide access to Boquillas del Carmen, Mexico, seen in the distance. (AP Photo/Christopher Sherman)