I saw the same process as in the video. It's was during a trek in the Sierra Nevada de Santa Marta, in the northeast of the country. A strange region - the bottom of the mountains is controlled by the army, the middle by the paramilitary, and the top by the Farc. At some point in the trek a farmer invited us to visit his "little lab". He explained all the stages of treatment of the coca plant, exactly as you see in the film. But I did notice a small error - that at the end of the process, it's lime [whitewash] that he adds, not cement.

These small-scale farms move around regularly to avoid being caught by the army. They don't produce cocaine, but bazuco - a coca paste that's still raw. The final operation, which makes it possible to extract the powder - cocaine - is only done by the traffickers. That's because it's a difficult task that needs specific materials, but also because the traffickers want to keep control over the sale of the drug. The farmers we visited sold their bazuco to the paramilitaries, who then take the drug to the Colombian coast to be treated and exported.

These farmers don't have any choice but to be a part of trafficking. Firstly because it's more lucrative than anything else. But also because if they refuse, they'll basically be shot.

I really hope people understand that there's nothing fun or romantic about drugs trafficking. It's drugs that are responsible for the country's violent climate, that allow the Farc to carry on taking hostages. Trafficking is the reason why Ingrid Betancourt is still imprisoned. Colombian people know that and they consume much less than the Americans or Europeans, even if the drug here is much cheaper (€3 for a gram of cocaine in comparison with around €70 - €100 in Europe).

I'd like to get the message across that the drugs problem lies with demand rather than supply. Fighting against the producers and the traffickers is useless if you don't address the root of the problem - consumption. In other words, as long as there are French people willing to pay €100 for a sachet of coke, we can't stop Colombian farmers from making it."