In the jungle-clad mountains of the Sierra Nevada, Colombia, we visited a cocaine lab run by a coca farmer. How do you make cocaine? Take some coca leaves, a number of nasty substances, add some bullets, some scary para-military soldiers, a dash of guerrillas, some corrupt cops and a pinch of coca farmer, and you've got one of the world's deadliest drug cocktails. Produced by Wanderlusts for LonelyPlanet.tv.