The officers of the Quincy (Mass.) Police Department have begun carrying Narcan, which reverses overdoses from opiods such as heroin and painkillers derived from opium.

The medication, which can be administered with a nasal spray, blocks narcotic's ability to attach to brain cells, so the subject can resume normal breathing. About 200 officers have been trained to use the antidode. There are two doses in every cruiser, Detective Patrick Glynn told CBS News.

Quincy police have reversed 170 overdoses since 2010 and now require every patrol officer to carry it.