"DEA Agent Jack Riley tells the inside story of his 30-year hunt for the drug kingpin known as El Chapo, and reveals the true causes of the American opioid epidemic. Jack Riley, grandson of a Chicago cop known for using his fists, was born to be a drug warrior. Joaquín "El Chapo" Guzmán Loera, who farmed marijuana and opium poppies as a teenager in Mexico, was born to be a drug lord. Their worlds collided when Riley, a career special agent with...