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.

Next Airing:

Go to the front lines with San Diego Border Patrol Agents in their ongoing battle against drug smuggling and illegal immigration. Follow along as they discover 30 people elaborately concealed in the back of a tractor-trailer. Watch as they race under the cover of a blinding fog to prevent illegal border crossings. And witness the unearthing of a huge payload of marijuana carefully hidden behind the cab of a tractor-trailer.