Arrests Expose Rift Between N.Y.P.D. and ‘Violence Interrupters’

Overall, the interrupter model appears to be effective, according to a 2017 study by the John Jay College of Criminal Justice. In one Bronx neighborhood, the number of shooting victims fell 63 percent during a period when interrupters were active compared with rates before the program began, the study found.

New York City rolls out most detailed plan yet to reduce gun violence

Researcher Jeffrey Butts said the city should partner with a third-party to monitor and analyze the data in a way that is “systematic and unbiased.” “As long as the internal people answer to the same boss, it’s really hard to deliver bad news,” said Butts, director of the Research and Evaluation Center at the John Jay College of Criminal Justice. “The chief executive often hears how great things are going and never hears that there were indicators of things not going that great.”