What novelist Don Winslow thinks of America's war on drugs

Novelist Don Winslow has spent 20 years chronicling the war on drug cartels south of the U.S. border that have triggered unspeakable violence and caravans of asylum-seekers searching for safety in the U.S. His new novel “The Border" is the concluding work of a trilogy that was born out of a single news story in the late-1990s. Jeff Greenfield recently sat down with Winslow to learn more