Boston EMS worker under investigation for tampering with patients' pain medications.
Massachusetts health officials say an EMS worker tampered with vials of drugs and dozens of people may have been affected.
Health officials confirmed a city paramedic with Boston Emergency Medical Services is off the job for allegedly tampering with vials of painkillers.
The paramedic is accused of tampering with powerful drugs like Fentinol and morphine.
The Boston Public Health Commission has notified 57 patients that they may have received compromised medications during EMS treatment.
They initially identified 64 patients, but seven died for reasons related to their medical event or initial injury.
Officials are focusing on a six-week period during the summer of 2011.
They said they only learned about he possible tampering last month.
Health officials are not aware of this paramedic having any infectious disease.
They want the public tested in an abundance of caution.
Free screenings for infectious diseases is available and established an incident hotline.
City health officials wonâ€™t release the paramedic's name, but they did confirm Boston police are conducting a criminal investigation.
So far no charges have been filed.