Fentanyl does whatever you want it to baby. Just so long as that involves beating your wife and kids when there isn’t a black kid nearby.
Fentanyl itself is an opiod so it is a downer. But fentanyl, as reported by the media and embraced by cops, is a magic wonderdrug where a single particle in a hundred mile radius will instantly infect every cop through enough PPE that they could survive a zombie infestation and make them do whatever crazy shit they got caught doing.