The Opioid Epidemic in the United States

David Walliams: I've always been fascinated by the economics of this drug problem. But what you've done is you're actually talking about a new drug, Xylazine. Give me the context of what's going on in the States in terms of overdoses. We've heard about fentanyl. Explain to me what’s going on.Walliams: The US has been fighting a war on drugs for over half a century. This really started with a synthetic opioid called fentanyl.