TOHONO O'ODHAM NATION, AZ - JANUARY 18: U.S. Special Agent Rodney Irby looks over some 500 lbs. of marijuana seized on January 18, 2011 in the Tohono O'odham Nation, Arizona. Irby is a member of the ... more 
TOHONO O'ODHAM NATION, AZ - JANUARY 18: U.S. Special Agent Rodney Irby looks over some 500 lbs. of marijuana seized on January 18, 2011 in the Tohono O'odham Nation, Arizona. Irby is a member of the Shadow Wolves, the only Native American unit of the U.S. Immigration and Customs Enforcement agency. The unit tracks and interdicts drug smugglers and illegal immigrants crossing into the Tohono O'odham Indian reservation along a 72-mile stretch of the U.S.-Mexico border. (Photo by John Moore/Getty Images) less 
1 / 28
Getty Images | Photo By John Moore / Getty Images
Tue, Jan 18, 2011 11:45 PM EST