Fentanyl is certainly scary, but law enforcement folks really exaggerate the risk of incidental exposure. They're so scared of it, they imagine the symptoms of intoxication. The DEA has guidance for first responders -

Fentanyl Safety Recommendations for First Responders - DEA.gov https://www.dea.gov/sites/default/files/Publications/Final%20STANDARD%20size%20of%20Fentanyl%20Safety%20Recommendations%20for%20First%20Respond....pdf