FILE - In this June 4, 2008 file photo, a police plane sprays herbicides over coca fields in El Tarra, in the Catatumbo river area, near Colombia's northeastern border with Venezuela. Colombia's president Juan Manuel Santos announced Tuesday, Sept. 22, 2015, that the country is overhauling its anti-drug strategy, aiming to boost alternative development efforts and relying more on manual eradication to replace controversial U.S.-backed aerial spraying of the crop used to make cocaine. (AP Photo/Luis Robayo, File)