A dangerous chemical called xylazine is being mixed into fentanyl across the U.S., but who's doing it and why is a mystery. The government still doesn't identify and track new drug threats.
A deadly new street drug caught the US off guard Experts say it ll happen again opb.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from opb.org Daily Mail and Mail on Sunday newspapers.