BROOKLYN - More law enforcement agencies statewide will soon be trained on how to administrate the heroin antidote Narcan.

Narcan takes just three minutes to revive a person overdosing on heroin or prescription pain medication by pushing the drug out of their system.

Mary Callahan, the senior management director of outpatient services at Odyssey House, says Narcan is a gift. "By doing this, they're saving a measurable amount of people from overdose," says Callahan, who has 15 recovering opioid addicts at the recovery center.

Attorney General Eric Schneiderman has allocated millions of dollars to put Narcan in police cars and train officers how to use it.