Armando Tenorio at his home in Mexico last December. Tenorio spends most of the year working on a blueberry farm in Canada, on a temporary work permit, to support his family in Mexico. Dominic Bracco II/The Washington Post/Getty Images hide caption

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Brazilian federal police patrol the Mamore River, which separates Brazil from Bolivia. The river is used by traffickers to ferry cocaine from Bolivia into Brazil, where cocaine consumption is rising rapidly. Juan Forero/Getty Images hide caption

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