National Geographic Society

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A fence crafted from an old military landing mat separates Tijuana from San Diego. The San Ysidro border crossing is the busiest in the world, with over 40 million people entering the U.S. through the port in 2005 alone.

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Go undercover with officers as they attempt to expose a human smuggling ring, track down suspected illegal immigrants traveling on foot and uncover a woman wedged inside the front seat of the car.