Members of the sheriff's office determined that the seal on a medic box containing vials of fentanyl had been broken.
Further investigation uncovered that the security packaging on fentanyl vials within the medic box had also been compromised, according.
According to the sheriff's office, "in response to these findings, detectives conducted simultaneous investigations at all county medic units," which led to the discovery of other tampering incidents involving multiple narcotics boxes.
Detectives have identified a suspect and charges are pending. Anyone impacted by the incident will be contacted by the Department of Emergency Services, officials added.
Check Daily Voice for updates.
Want breaking news in the DMV as it happens, or want to contribute? Join the DMV All Incidents Facebook group.
Click here to follow Daily Voice Greenbelt and receive free news updates.