“It is worth warning people at nightclubs who might use cocaine recreationally about the possibility of fentanyl contamination,” opioids program manager Kendra Viner of the Philadelphia Department of Public Health told BuzzFeed News. But overall, only about 2% of seized cocaine vials in Philadelphia are contaminated by fentanyl.
https://www.buzzfeednews.com/article/danvergano/cocaine-meth-overdose-wave
By Dan Vergano
The Collected Works of Jim Garrow 