Does It Work?
Four categories of evidence appear across documented programs, at different levels of independence and rigor.
What the Evidence Shows
Overdose Response Capacity (Program-Reported Activity)
Minneapolis, Gainesville, and University of Georgia ambassador programs carry Narcan and report responding to overdoses as part of regular patrol.1 These are program descriptions, not independently evaluated outcomes. No commercial district ambassador program has published a count of lives saved equivalent to what transit programs report.
Voluntary Compliance with Behavioral Requests (Program-Reported Data)
Austin’s ambassador program achieves an 86% voluntary compliance rate when team members ask individuals who are in violation of local ordinances to change their behavior.2 This means that in 86 of 100 situations, a verbal request from an unarmed ambassador resolves a quality-of-life situation without police involvement, force, or arrest. This figure is specific to Austin’s program design, which deploys ambassadors on bicycles in lime green vests with body cameras, focused on downtown quality-of-life issues.2
Service Connection Counts (Program-Reported Activity Data)
Multiple programs report contact and connection figures for their work with people experiencing homelessness and other vulnerable populations:
Gainesville: more than 100 people experiencing homelessness connected to services, housing, and medical care in the first two months of the program’s operation.3
Denver Ballpark: contact with nearly 150 unhoused people in two weeks of March 2025, “helping connect them to services.”4
San Francisco CAP: 65,110 wellness checks and more than 4,500 safety escorts in fiscal year 2023-2024, plus 48,811 reports to 311.5
These are program-reported activity counts, not independently evaluated outcomes.
Police Workload Relief (Police Statements and Program Claims)
Duluth, Georgia police called their program “a game changer” in reported statements, citing freed capacity to focus on crime.6
Minneapolis credited ambassadors with helping “ease the burden placed on local police.”7
Gainesville’s program “lessened the burden on local law enforcement” according to program reporting.8
University of Georgia Police Chief Jeff Clark described ambassadors as “supplement[ing] police officers as eyes and ears on the ground… performing different jobs than campus police.”9
Crime Reduction Claims (Individual Accounts; No Controlled Evidence)
Oakland business owner Des To of Alice Street Bakery Café reported that “over the past few months, she hasn’t witnessed any robberies near or at her business, which she said were more common in 2020 and 2021.”10 West Hollywood resident Emilio Castellanos described his local park transforming from “a magnet for drifters and drugs” to “a thriving centerpiece to our neighborhood.”11 Greater Saint Louis, the business group that bankrolled the downtown ambassador program, stated that “mere presence of safety ambassadors deters crime.”12
A 2020 peer-reviewed study by Gonzalez and Komisarow found a 17% total crime reduction on monitored blocks in the Chicago Safe Passage program, which deployed unarmed community members to monitor school routes.13 An earlier working paper draft of this study reported 29%; the peer-reviewed published figure is 17%.
A systematic review of crime prevention interventions found that a diffusion of crime control benefits — crime reductions in areas adjacent to but not covered by an intervention — is more common than displacement.14
What We Don’t Know
The NRI’s 2024 mobile crisis survey found a gap between claimed and actual program delivery in related public safety program types — 70% of mobile crisis programs claim 24/7 availability but only 40% actually staff all shifts.15 No equivalent audit of ambassador program claimed-versus-actual coverage has been published.
Three questions documented programs have not answered: whether service referrals result in lasting outcomes; whether crime rates in covered areas diverge from comparable uncovered areas over time; and what ambassador staff turnover rates are and how turnover relates to program outcomes.
The Adjacent Evidence
Chicago Safe Passage. Gonzalez and Komisarow (2020) found a 17% total crime reduction on monitored blocks in Chicago’s Safe Passage program, which deployed unarmed community members on school routes.16
Foot patrol research. Jerry H. Ratcliffe and colleagues found that foot patrol in targeted areas produces crime reduction effects in the Philadelphia Foot Patrol Experiment.17
Bottom Line
The evidence documented above falls into four tiers: program-reported activity counts (Gainesville, Denver, San Francisco), Narcan capability across commercial and campus programs, police statements (Duluth, Minneapolis, Gainesville, UGA), and adjacent independent research (Safe Passage, NIJ displacement review, Philadelphia foot patrol). No controlled study of a commercial district or campus ambassador program has been published.
Narcan deployment across non-transit programs: Minnesota Daily, Maya Bell (Minneapolis), https://mndaily.com/293044/city/community-safety-ambassador-program-for-south-minneapolis-starts-in-may/; WUFT Gainesville, Martine Joseph, https://www.wuft.org/public-safety/2025-03-21/downtown-ambassadors-night-watch-is-making-a-difference; WUGA 90.7 FM (UGA), https://www.wuga.org/local-news/2024-08-10/uga-invests-over-7-million-to-strengthen-campus-security
KUT Austin (NPR), Lucciana Choueiry, July 24, 2024. https://www.kut.org/austin/2024-07-24/downtown-austin-safety-team-increases-patrol-in-response-to-apd-staffing-shortage Program-reported figure from Austin’s specific program design.
WUFT Gainesville, Martine Joseph, March 21, 2025. https://www.wuft.org/public-safety/2025-03-21/downtown-ambassadors-night-watch-is-making-a-difference
Denver7 (KMGH), Claire Lavezzorio, “Ballpark ambassadors out in full force on Rockies opening day,” March 2025. https://www.denver7.com/news/local-news/ballpark-ambassadors-out-in-full-force-on-rockies-opening-day Program-reported figures.
ABC7 San Francisco, Luz Pena, June 2024. https://abc7news.com/post/san-francisco-community-ambassador-program-could-eliminated-amid/14972876/ Program-reported activity figures.
WSB-TV Atlanta (WSB-TV 2), Matt Johnson, “Civilians take non-emergency calls in Duluth, freeing police for critical duties.” https://www.wsbtv.com/news/local/gwinnett-county/civilians-take-non-emergency-calls-duluth-freeing-police-critical-duties/VBFYGRJ2UVBV5B7EMOHE3GE2Y4/ Police statement; narrative characterization of program.
Minnesota Daily, Maya Bell, March 18, 2025. https://mndaily.com/293044/city/community-safety-ambassador-program-for-south-minneapolis-starts-in-may/
WUFT Gainesville, Martine Joseph, March 21, 2025. https://www.wuft.org/public-safety/2025-03-21/downtown-ambassadors-night-watch-is-making-a-difference
WUGA 90.7 FM, August 2024. https://www.wuga.org/local-news/2024-08-10/uga-invests-over-7-million-to-strengthen-campus-security
Oaklandside, Roselyn Romero, September 2023. https://oaklandside.org/2023/09/19/community-ambassadors-oakland-public-safety-policing/
Beverly Press coverage of West Hollywood ambassador program. Note: the specific Beverly Press article quoting resident Emilio Castellanos could not be independently located via search engines. The quote is documented in the Safer Cities newsletter, July 2022. https://safercitiesresearch.com/the-latest/two-big-bets-on-the-power-of-unarmed-security-ambassadors-to-increase-safety
Greater Saint Louis, Inc. press release, October 2024. https://greaterstlinc.com/news/downtownstl/greater-st-louis-inc-announces-launch-downtown-public-safety-ambassador-program Organizational claim; not independently verified.
Gonzalez, Robert M. and Komisarow, Sarah, “Community Monitoring and Crime: Evidence from Chicago’s Safe Passage Program,” Journal of Public Economics, Vol. 191, November 2020. The published journal article reports a 17% total crime reduction on monitored blocks. An earlier working paper draft circulated a 29% figure; the peer-reviewed published version is 17%. https://www.sciencedirect.com/science/article/abs/pii/S0047272720301146 — The Safe Passage workers were unarmed community monitors on school routes — structurally similar to safety ambassadors but in a specific context (school routes, during arrival and departure times).
National Institute of Justice, “Diffusion of Crime Control Benefits,” research summary. https://nij.ojp.gov/topics/articles/research-brief-diffusion-crime-control-benefits See also John E. Eck and Edward R. Maguire, “Have Changes in Policing Reduced Violent Crime?” in The Crime Drop in America (2000), and the broader systematic review literature on crime displacement.
National Research Institute (NRI), “Mobile Crisis Survey 2024,” finding that 70% of mobile crisis programs claim 24/7 availability but only 40% actually staff all shifts. Cited as an analogy for the gap between claimed and actual program delivery that is documented in related public safety program types.
Chicago Safe Passage study: see footnote 13 above.
Foot patrol research: Jerry H. Ratcliffe et al., “The Philadelphia Foot Patrol Experiment,” Criminology, 2011. https://onlinelibrary.wiley.com/doi/abs/10.1111/j.1745-9125.2011.00240.x General finding: foot patrol in targeted areas produces crime reduction effects, attributed primarily to sentinel deterrence and police-community relationship building.