Last year, Colombia began phasing out aerial eradication of coca bushes, whose leaves are the main ingredient in the production of cocaine. In making the decision, the government cited the health risks of spraying glyphosate, the herbicide it had used to target coca crops for roughly two decades. The government switched to a program of manual eradication, employing teams of people to uproot the bushes, a lucrative crop in some regions of the country, by hand. This slower, more laborious process has brought with it the prospect of greater resistance from local growers, which would hamper attempts to destroy illegal coca plantations. Statistics from the Colombian government appear to confirm that this is already happening: Eradication teams on the ground have been prevented from conducting their work nearly 400 times in so far 2016, compared with 163 times in 2015.