In this Monday, March 25, 2013 photo, Border Patrol agent Richard Gordon, a 23-year veteran of the agency, holds a small bunch of leaves as he demonstrates how illegal immigrant brush their foot prints while trying to avoid being tracked by Border Patrol agents 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 small bunch of leaves as he demonstrates how illegal immigrant brush their foot prints while trying to avoid being tracked by Border Patrol agents 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 small bunch of leaves as he demonstrates how illegal immigrant brush their foot prints while trying to avoid being tracked by Border Patrol agents 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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