The government of the United States is reported to have spent $4bn fighting Colombia's cocaine trade since 2000. It has been doing this by spraying fields of coca with chemicals, destroying the crop. The US government justifies this by saying it is helping to stabilise Colombia, where a civil war, funded by cocaine profits, has raged for decades.

The Head of the US Office of National Drug Control Policy said: “The terrorist groups are weaker… they are receiving less money, murders are down, kidnappings are down”. But now, a recent US govt. survey has found that an extra 26% of land under cultivation and that production is more dispersed.

In 2004, 114,100 hectares (440 sq miles) were found growing coca; in 2005, in the same area, cultivation had fallen to 105,400 hectares, however, the survey area was expanded in 2005 by 81%. In this new area, a further 39,000 hectares were found growing coca, making 144,100 hectares in total, an increase of 26% overall.

Critics of the spraying policy say that coca production was not going to be reduced just because fumigation flights spray some fields, as long as these farmers don't have any other economic options, except to cut down forests to grow coca somewhere else. There's also the matter of demand for cocaine remaining steady. The US has also found that production is also increasing in Peru and Bolivia. Similar spraying is taking place in Afghanistan, justified on similar grounds.