August 31, 2004
Anti-Narcotics police keep guard in a coca field as a plane fumigates the crop close to Tumaco, about 360 miles southwest of Bogota, Colombia in this Sept. 12, 2000 file photo. Authorities suspect a new threat is lurking in the mountains and jungles of Colombia: Not a new rebel cadre, but genetically altered coca plants that may be taller, bushier and faster-growing than the regular kind _ and possibly more resistant to herbicides. (AP Photo/Scott Dalton, file)
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