Sam Quinones' book The Least of Us described how fentanyl pills, mass manufactured in Mexico and marketed on social media have created huge new populations of addicts in America. Today, reporter Matthew Reisen of the Albuquerque Journal narrows the focus to the streets of New Mexico's biggest city where fentanyl is addicting new generations of people. Reisen talked with officers from the DEA and APD, with sellers and buyers of America's new king of addictive drugs.