The US has been grappling with an opioid crisis for decades, but the problem has been exacerbated by the arrival of fentanyl – a synthetic drug 50 times more potent than heroin. What roles do China and India play in the global illicit fentanyl trade? Post correspondent Khushboo Razdan and independent investigative journalist Ben Westhoff walk us through their reporting. For more on this: https://sc.mp/8c9626