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Drug-Smuggling Grandma

An agent looking through an underground tunnel. Claustrophobic tunnels like these could be infested with cockroaches and other parasites. Nogales, AZ.

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In a remote corner of Arizona desert, Border Patrol agents use night vision technology to track a group of illegal immigrants. Employing a Blackhawk helicopter and ATVs, agents arrest a suspected smuggler backpacking drugs into the U.S. Meanwhile, officers at a port of entry stop an unlikely but increasingly common drug smuggler -- an elderly woman.