Fentanyl, the cheap and synthetic opioid 50 times more potent than heroin, has caused the number of fatal overdoses in the United States to soar to nearly 110,000 in 2022, a record. But now yet another threat is causing concern across America, as xylazine, an animal seditative is being added to the drug supply, causing severe wounds and complicating overdose prevention. In New York, harm reduction groups and authorities are doing their best to protect drug users against the flesh-eating drug. IMAGES AND SOUNDBITES ARRANGED IN SEQUENCES