Deterring Gang-Involved Gun Violence: Measuring the Impact of Boston’s Operation Ceasefire on Street Gang Behavior

Objectives

The relatively weak quasi-experimental evaluation design of the original Boston Operation Ceasefire left some uncertainty about the size of the program’s effect on Boston gang violence in the 1990s and did not provide any direct evidence that Boston gangs subjected to the Ceasefire intervention actually changed their offending behaviors. Given the policy influence of the Boston Ceasefire experience, a closer examination of the intervention’s direct effects on street gang violence is needed.

Methods

A more rigorous quasi-experimental evaluation of a reconstituted Boston Ceasefire program used propensity score matching techniques to develop matched treatment gangs and comparison gangs. Growth-curve regression models were then used to estimate the impact of Ceasefire on gun violence trends for the treatment gangs relative to comparisons gangs.

Results

This quasi-experimental evaluation revealed that total shootings involving Boston gangs subjected to the Operation Ceasefire treatment were reduced by a statistically-significant 31 % when compared to total shootings involving matched comparison Boston gangs. Supplementary analyses found that the timing of gun violence reductions for treatment gangs followed the application of the Ceasefire treatment.

Conclusions

This evaluation provides some much needed evidence on street gang behavioral change that was lacking in the original Ceasefire evaluation. A growing body of scientific evidence suggests that jurisdictions should adopt focused deterrence strategies to control street gang violence problems.     

Desistance and Legitimacy: The Impact of Offender Notification Meetings on Recidivism among High Risk Offenders

Legitimacy-based approaches to crime prevention assume that individuals will comply with the law when they believe that the law and its agents are legitimate and act in ways that are “fair” and “just.” Currently, legitimacy-based programs are shown to lower aggregate levels of crime; yet, no study has investigated whether such programs influence individual offending. Using quasi-experimental design and survival analyses, this study evaluates the effectiveness of one such program—Chicago’s Project Safe Neighborhoods’ (PSN) Offender Notification Forums—at reducing individual recidivism among a population of returning prisoners. Results suggest that involvement in PSN significantly reduces the risk of subsequent incarceration and is associated with significantly longer intervals that offenders remain on the street and out of prison. As the first study to provide individual-level evidence promoting legitimacy-based interventions on patterns of individual offending, out study suggests these interventions can and do reduce rates of recidivism.     

The Concentration and Stability of Gun Violence at Micro Places in Boston, 1980–2008

Boston, like many other major U.S. cities, experienced an epidemic of gun violence during the late 1980s and early 1990s that was followed by a sudden large downturn in gun violence in the mid 1990s. The gun violence drop continued until the early part of the new millennium. Recent advances in criminological research suggest that there is significant clustering of crime in micro places, or “hot spots,” that generate a disproportionate amount of criminal events in a city. In this paper, we use growth curve regression models to uncover distinctive developmental trends in gun assault incidents at street segments and intersections in Boston over a 29-year period. We find that Boston gun violence is intensely concentrated at a small number of street segments and intersections rather than spread evenly across the urban landscape between 1980 and 2008. Gun violence trends at these high-activity micro places follow two general trajectories: stable concentrations of gun assaults incidents over time and volatile concentrations of gun assault incidents over time. Micro places with volatile trajectories represent less than 3% of street segments and intersections, generate more than half of all gun violence incidents, and seem to be the primary drivers of overall gun violence trends in Boston. Our findings suggest that the urban gun violence epidemic, and sudden downturn in urban gun violence in the late 1990s, may be best understood by examining highly volatile micro-level trends at a relatively small number of places in urban environments.     

Recidivism and the Availability of Health Care Organizations

Incarceration has been identified as a cause of poor health in current and formerly incarcerated individuals. Given the high likelihood of being in poor health when exiting prison, it is plausible that health impacts recidivism. Furthermore, ex-prisoners cluster in disadvantaged neighborhoods that are unlikely to have decent health services. Currently, there is insufficient research to examine this relationship at an ecological level. In this study, we investigate the relationship between the availability of health care organizations (HCOs) and their changes over time with neighborhood level recidivism, and how these relationships may be moderated by neighborhood disadvantage. We determine that the effect of HCOs on recidivism is indeed moderated through disadvantage: as disadvantage increases, the negative effect of losing significant amounts of HCOs on recidivism accelerates. Our results suggest that while increasing HCOs in disadvantaged neighborhoods is important, keeping HCOs in place is equally important for moderating negative neighborhood level outcomes.