Stock Photo - Policing the ""Bunker Hill"" area of the U.S./Mexico Border near Tijuana, a Hispanic Border Patrol officer uses a flashlight to look for footprints of illegal immigrants in a procedure known as ""sign cutting."" The Border Patrol is part of the U.S. Department of Homeland Security. Note border fence in background.

Stock Photo: Policing the ""Bunker Hill"" area of the U.S./Mexico Border near Tijuana, a Hispanic Border Patrol officer uses a flashlight to look for footprints of illegal.

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