Careers in the cocaine-trafficking business are usually short. It's not only a highly risky profession, fraught with the possibility of long jail sentences, but it can be deadly if the cartels get to you first. Not for Luis Antonio Navia. For 25 years the Cuban-American smuggled hundreds of tons of white powder for the biggest cartels in Colombia and Mexico, including Pablo Escobar's Medellín Cartel. What made him good at his dangerous job was amassing trusted contacts, losing very few shipments of coke, and maintaining a low profile. He refused to carry a weapon. He also maintained a normal family life with a Colombian wife and two young children. But he was never far removed from the most brutal violence imaginable. This is his story.