Joaquin Guzmán Lopez and Ismael Zambada, both leaders in the Sinaloa Cartel, were arrested by US authorities after they landed on a runaway in New Mexico. The story behind the arrest and why they flew to the United States is not clear, but the possibilities are intriguing. Steven Dudley, the co-founder and co-director of Insight Crime, gives the background on who these two men are, what is known about the arrests and why cartel drug trafficking is harder than ever for the authorities to disrupt.