NEWYou can now listen to Fox News articles! Authorities on Friday identified the mystery substance that hospitalized more than a dozen first responders after they responded to a New Mexico home where three people died in a suspected overdose incident.Officials said first responders were exposed to fentanyl after arriving at a home in Mountainair, New Mexico, where four people were found unresponsive.Two victims were pronounced dead at the scene, while a third later died at the University of New Mexico Hospital. A fourth person survived.”Preliminary findings indicate this incident is tied to exposure to a powdered opioid substance within the…