National Geographic Society

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Fog of War

t sunset, a group of border patrol agents on ATVs survey the international boundary that separates San Diego from Tijuana. This San Ysidro border crossing is the busiest in the world, with over 40 million people entering the U.S. through this port in 2005 alone.

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Go to the front lines where border agents discover 30 people concealed in the back of a tractor-trailer, race under the cover of a blinding fog to prevent illegal border crossing and unearth a huge payload of marijuana.