February 20, 2012 5:26 PM

Pot-smuggling tunnels in Tijuana grow more elaborate

U.S. agents have been waging war against the drug smuggling tunnels for years, using a range of high-tech devices from ground-penetrating radar to seismic sensors to find and destroy them. But despite the efforts, drug smugglers continue to build the tunnels, often spending $1 million to dig a single pathway equipped with lighting, forced-air ventilation, water pumps, shoring on walls and hydraulic elevators.

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