A program in Denver removing police from certain 911 calls led to a 34% reduction in low-level crimes, a study Wednesday found amid a growing wave of cities changing their responses to mental health crises.

The Support Team Assistance Response, or STAR, pilot program, prevented nearly 1,400 crimes during its six-month pilot launched in June 2020, the results showed.

“We think we have something that’s really seminal in terms of suggesting the promise of this fairly radical reform of how we do emergency response,” said study author Thomas Dee, a professor at Stanford’s Graduate School of Education who studies public policy.

The growth of the non-police response programs have accelerated since calls for changes to policing after the 2020 deaths of George Floyd in Minneapolis and Daniel Prude in Rochester, New York, who was suffering a mental health crisis when he died in police custody. 

Advocates urge removing police from 911 calls related to mental health crises, substance use disorders, homelessness and other social welfare issues. Mental health advocates and law enforcement experts often agree certain types of 911 calls do not need a police response.

More than 1 in 5 people fatally shot by police since 2015 had a mental illness, according to a Washington Post database of fatal shootings by on-duty officers. 

MORE ON THE STAR PROGRAM:Denver successfully sent mental health professionals, not police, to hundreds of calls

Similar programs have cropped up in New York, Washington and San Francisco, and many organizers cite the program in Eugene, Oregon, known as Crisis Assistance Helping Out On The Streets, or CAHOOTS, as a model of success.

While the specific structures of the programs often vary in each city, the goal is to team up mental health clinicians and emergency medical technicians to respond to certain 911 calls instead of police officers. The programs are different from Crisis Intervention Training for police and co-responder models, which pair police officers with non-police responders.

“It’s worth underscoring whether your politics are ‘back the blue’ or ‘defund the police,’ there’s a lot to like about this type of program,” Dee said.

How the Denver pilot succeeded

In Denver, the pilot consisted of two-person teams of a medic and a clinician in a van from 10 a.m. to 6 p.m. on weekdays in eight police precincts. The Stanford study focused on crime data related to offenses the program was largely intended to target, such as disorderly conduct, trespassing and drug use, but it also examined trends in crimes, such as burglary or weapons charges. It looked at data from before and during the pilot as well as in the eight police precincts where the pilot operated and those it didn’t.