In this Sept. 19, 2014, file photo, a military attack helicopter flies over Pichari, Peru in the Apurimac, Ene and Mantaro river valley, or VRAEM. It is the world's No. 1 coca-growing region. Roughly half of Peru’s cocaine exports have been ferried eastward, police say, since the rugged Andean nation became the world’s leading producer of the drug in 2012. (AP Photo/Rodrigo Abd, File)