AdvertisementOn The Hunt For Poppies In Mexico — America's Biggest Heroin SupplierJanuary 14, 2018James FredrickfacebookEmailA Mexican soldier piles poppies for incineration near the town of Tlacotepec, in Guerrero state, Mexico. The army says it slashes and burns poppy when fields are too difficult to access by helicopter or when it wants to protect fruits and vegetables growing nearby. (James Fredrick for NPR)