Gov. Chris Christie is expanding a pilot program that allows police officers to carry and administer a drug that can quickly reverse heroin overdoses.

Christie announced Tuesday morning that police in every county, as well as state troopers, will now be trained to administer Narcan. The drug is injected through the nose and can reverse an overdose that would likely otherwise be fatal.

The governor announced a pilot program in April allowing law enforcement officers to administer the drug in Ocean and Monmouth counties.

More than 28,000 certified EMTs have also been issued waivers allowing them to treat overdosing patients.

Officials credit the program with helping save more than 40 lives.

Christie visited the Rescue Mission of Trenton to make the announcement.