U.S. officials estimate up to three-quarters of the cocaine that enters through the country's southern border passes through Central America, by land or sea.
The corridor has become a smuggler's paradise: under-funded and often corrupt security forces, scant U.S. counter-drug operations, vast stretches of lawless jungle and shoreline, and a compliant population.
In the first of a three-part series, NPR's John Burnett reports that the countries once known as banana republics are fast becoming "cocaine republics."
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