A peek into opioid users' brains as they try to quit

Government scientists are starting to peek into the brains of people caught in the nation's opioid epidemic, to see if medicines proven to treat addiction, like methadone, do more than ease the cravings and withdrawal. Do they also heal a brain damaged by addiction? One reason: "People say you're just changing one drug for another," said Dr. Nora Volkow, director of the National Institute on Drug Abuse, who is leading that first-of-its-kind study.