Velva Poole has spent about 20 years as a social worker, mostly in Louisville, Ky. She's seen people ravaged by methamphetamines and cocaine; now it's mostly opioids. Most of her clients are parents who have lost custody of their children because of drug use. Poole remembers one mom in particular.
"She had her kids removed the first time for cocaine. And then she had actually gotten them back," she says. But three months later, the mother relapsed and overdosed on heroin.