GLOUCESTER (CBS/AP) — Police in Gloucester say the heartbroken mother of a man who died of a heroin overdose is credited with helping police arrest two men who allegedly sold the drug to her son.

Gloucester Police Chief Leonard Campanello said in a statement that the woman, who lives on the North Shore, had heard of the police department’s ANGEL program, which offers addicts a chance for treatment rather than arrest.

READ MORE: 4-Year-Old Hurt In Hit-And-Run In Lynn

While it was too late to save her own son, Campanello said the woman reached out to police for help in catching the dealers.

According to the court documents, the woman provided police with a phone number belonging to someone named “Jo-Jo” who she believed sold drugs to her son in the past.

READ MORE: Over 300,000 Baby Pacifiers Recalled Due To Choking Hazard

Police conducted an undercover drug buy at Gloucester’s State Fish Pier and arrested two men from Lynn, William Piazza and Eugenio Valentin, on charges of distributing a Class A drug. Police recovered roughly $500 in heroin and $805 in cash from the pair.

Piazza’s criminal complaint states that he has numerous alias names and has two different FBI numbers.

Dozens of police departments around the country have adopted some aspects of Gloucester’s program.

MORE NEWS: Massachusetts Nurses Union Wants Baker's Help To Address 'Overwhelmed And Burned Out' Workers

(TM and © Copyright 2015 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2015 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)