As cocaine consumption falls in the United States, South American drug traffickers have begun to pioneer a new soft target for their product: big and increasingly affluent Brazil.
And the source of the cocaine is increasingly Bolivia, a landlocked country that shares a 2,100-mile border with Brazil.
As Brazilian police officers and border agents can attest, the drug often finds its way to Brazil by crossing the Mamore River, which separates the state of Rondonia from Bolivia in the heart of South America.
They are called "crypto-Jews" or "lost Jews," and in recent years they have emerged in remote places as scattered as India, Brazil, the American Southwest and here in Colombia.
They were raised as Christians but believe they have discovered hidden Jewish roots, prompting many to return to Judaism. Many say their ancestors were Sephardic Jews expelled from Spain more than 500 years ago, as the Spanish crown embarked on a systematic persecution of Jews.