51.   U.S. coca leaf expert Francisco Alvarez showed McCaffrey a coca plant and explained how farmers reproduce coca plants.

52.   Authorities have encountered stiff resistance in both Guaviare and Putumayo provinces to eradicating coca plants with a herbicide that farmers say has poisoned their legal crops and drinking water.

53.   Tension grew when the marchers approached the regional capital of Florencia to pressure the government to abandon plans to eradicate illegal cultivation of coca plants.

54.   The leaves of the coca plant are the raw material from which cocaine is processed.