In this Monday, March 25, 2013 photo, Border Patrol agent Richard Gordon, a 23-year veteran of the agency, holds a foot wrap made of carpet and wire which illegal immigrants use to disguise their footprints while trying to avoid being tracked after entering the United States in the Boulevard area east of San Diego in Boulevard, Calif. For the past 16 years Gordon has been one of the top "sign-cutters" or trackers in the Border Patrol. (AP Photo/Lenny Ignelzi)

Associated Press
In this Monday, March 25, 2013 photo, Border Patrol agent Richard Gordon, a 23-year veteran of the agency, holds a foot wrap made of carpet and wire which illegal immigrants use to disguise their footprints while trying to avoid being tracked after entering the United States in the Boulevard area east of San Diego in Boulevard, Calif. For the past 16 years Gordon has been one of the top "sign-cutters" or trackers in the Border Patrol. (AP Photo/Lenny Ignelzi)
In this Monday, March 25, 2013 photo, Border Patrol agent Richard Gordon, a 23-year veteran of the agency, holds a foot wrap made of carpet and wire which illegal immigrants use to disguise their footprints while trying to avoid being tracked after entering the United States in the Boulevard area east of San Diego in Boulevard, Calif. For the past 16 years Gordon has been one of the top "sign-cutters" or trackers in the Border Patrol. (AP Photo/Lenny Ignelzi)
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