The center of the national xylazine crisis is in Philadelphia. Photograph: Andrew Lichtenstein/Corbis/Getty ImagesDrugs The tranquilizer is increasingly mixed with the opioid in the US, giving rise to deadly overdoses and disturbing wounds Wilfred Chan Fri 31 Mar 2023 01.00 EDT Fentanyl – the deadliest drug in the country – is getting even more dangerous. Across...