Authorities busted the drug operation in November that was allegedly being run out of an apartment in the Mott Haven section.
While serving a search warrant, four undercover officers suffered possible fentanyl exposure.
One defendant faces assault charges, accused of throwing fentanyl at a law enforcement officer.
The officer exhibited fentanyl-related symptoms, including nausea and shortness of breath and was treated by emergency responders.
A second officer also experienced nausea and shortness of breath, and momentarily lost consciousness while being transported to a hospital via ambulance.
Agents and officers who entered the apartment found a large quantity of suspected heroin and fentanyl packaged into nearly 20,000 individual dose glassine envelopes, as well as additional quantities of narcotics in loose powder form.
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