Since 2006, more than 40,000 soldiers, police officers, traffickers and citizens have died in Mexico’s bloody drug war — from the mountains where pot and poppies are grown to the streets of Mexico City. Journalist Ioan Grillo tracks the rise of the cartels and their increasing influence north of the border in his book, "El Narco." He joins Steve Scher with a report from the front lines of the Mexican drug war.
