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Guadalupe Ramirez, director of the Customs and Border Protection port in Nogales, said drug traffickers recruit people in homes on a hilltop in Mexico to act as spies, reporting whether a canine unit is working, if imaging equipment is on and how each officer works (Cronkite News Photo by Emilie Eaton)

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Tease photo

Heroin's road to Arizona tests law enforcement, feeds a growing demand

Part 3 in a 4-part series

NOGALES, Ariz. - The floor, the ceiling, the speakers, the seats. Even the gas tank.