TOHONO O'ODHAM NATION, AZ - DECEMBER 09: As seen from the air, the shadow of a helicopter from the U.S. Office of Air and Marine joins a Border Patrol vehicle in following the tire tracks of drug ... more 
TOHONO O'ODHAM NATION, AZ - DECEMBER 09: As seen from the air, the shadow of a helicopter from the U.S. Office of Air and Marine joins a Border Patrol vehicle in following the tire tracks of drug smugglers moving north through the Sonoran Desert on December 9, 2010 in the Tohono O'odham Reservation, Arizona. The federal agency works closely with the U.S. Border Patrol in searching for smugglers and illegal immigrants who cross into the United States in remote areas all along the Mexican border. (Photo by John Moore/Getty Images) less 
1 / 31
Getty Images | Photo By John Moore / Getty Images
Sat, Dec 11, 2010 6:46 PM EST