National Geographic Society

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Contraband Corridor

Photo: A helicopter pilot over McAllen, TX

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Law enforcement battles to intercept the massive flow of illicit traffic moving through the Rio Grande Valley. Agents in McAllen, Texas, track a large group of illegal immigrants in the dark and find themselves outnumbered in a large field. Farther north, at the Falfurrias checkpoint, agents pull over a commercial bus after a canine alerts on the luggage compartment and find a suitcase filled with marijuana.