'I've never seen anything like it': Inside the center of the tranq drug crisis

Kensington, Philadelphia is a neighborhood long known as a place to buy and do drugs. Over the last few years, the street fentanyl here has been cut more often and with greater amounts of xylazine-- a veterinary tranquilizer that can cause skin wounds that often won't heal. CNN returned to Kensington this year to see what has changed. #CNN #News