The previous weekend saw 16 overdose deaths over three days.
"Fentanyl is not a choice. It's a contamination crisis."
The drug is often available where incense or marijuana paraphernalia is sold.
According to the CDC, 91 Americans die from opioid overdoses every day.
Last year marked the sixth consecutive year that fatal overdoses increased in the city, and the rate rose among all demographic groups.
Jack Fishman's widow is fighting for policy changes that will help treat America's growing opioid problem.
More people in the U.S. died from opioid overdoses than car accidents in 2014.
Law enforcement and advocacy groups say "molly" has become nothing more than a marketing term.
Researchers suggest that substituting pot for pills could be saving lives.