Interesting article forwarded to me by my cousin from the WSJ on Coca Eradication failing in Bolivia. Unfortunately you need a subscription to view it online but you can get a lot of info from Google News too.
And from Erythroxylum: The Coca Plant
The Andean culture and the coca plant have thrived for centuries. It is ironic that this same plant that is used as a cure in its homeland is the source for so much abuse and misunderstanding in other parts of the world.