Border Agents Struggle To Keep Immigrants From Illegally Crossing AZ Border

NOGALES, AZ - JUNE 02: An U.S. Customs and Border Protection bike patrol agent assists Mexican's being returned to Mexico after they were apprehended for entering the United States illegally June 2, 2010 in Nogales, Arizona. A fence which separates the cities of Nogales, Arizona and Nogales, Sonora Mexico is a frequent crossing point for people entering the United States illegally. During the 2009 fiscal year 540,865 undocumented immigrants were apprehended entering the United States illegally along the Mexican border, 241,000 of those were captured in the 262 mile stretch of the border known as the Tucson Sector. (Photo by Scott Olson/Getty Images)