has named a veterinary tranquilizer as an “emerging threat” when it’s mixed with the powerful opioid fentanyl, clearing the way for more efforts to stop the spread of xylazine. The Drug Policy Alliance, a group that advocates the harm done by drugs, applauds parts of the Biden administration’s plan, including looking for antidotes to reverse overdoses and developing quick tests to determine whether xylazine is present. Like xylazine, they are often added to other drugs — and users don’t always know they are getting them