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Racial and ethnic differences to the effects of state firearm laws: a systematic review subgroup analysis

By Rosanna Smart

Background

Despite growing evidence about how state-level firearm regulations affect overall rates of injury and death, little is known about whether potential harms or benefits of firearm laws are evenly distributed across demographic subgroups. In this systematic review, we synthesized available evidence on the extent to which firearm policies produce differential effects by race and ethnicity on injury, recreational or defensive gun use, and gun ownership or purchasing behaviors.

Main body

We searched 13 databases for English-language studies published between 1995 and February 28, 2023 that estimated a relationship between firearm policy in the USA and one of eight outcomes, included a comparison group, evaluated time series data, and provided estimated policy effects differentiated by race or ethnicity. We used pre-specified criteria to evaluate the quality of inference and causal effect identification. By policy and outcome, we compared policy effects across studies and across racial/ethnic groups using two different ways to express effect sizes: incidence rate ratios (IRRs) and rate differences. Of 182 studies that used quasi-experimental methods to evaluate firearm policy effects, only 15 estimated policy effects differentiated by race or ethnicity. These 15 eligible studies provided 57 separate policy effect comparisons across race/ethnicity, 51 of which evaluated interpersonal violence. In IRR terms, there was little consistent evidence that policies produced significantly different effects for different racial/ethnic groups. However, because of different baseline homicide rates, similar relative effects for some policies (e.g., universal background checks) translated into significantly greater absolute differences in homicide rates among Black compared to white victims.

Conclusions

The current literature does not support strong conclusions about whether state firearm policies differentially benefit or harm particular racial/ethnic groups. This largely reflects limited attention to these questions in the literature and challenges with detecting such effects given existing data availability and statistical power. Findings also emphasize the need for additional rigorous research that adopts a more explicit focus on testing for racial differences in firearm policy effects and that assesses the quality of race/ethnicity information in firearm injury and crime datasets.

Inj Epidemiol. 2023; 10: 67.

Research on a 15-Year Statewide Program to Generate Enhanced Investigative Leads on Crime Gun Violence

By Glenn L. Pierce; David Lambert; Daniel Trovato; and Peter Gagliardi

This study examines the innovative use of firearms related evidence to enhance violent crime investigations in New Jersey. This effort changed the use of firearms forensic evidence from a sole evidential focus to one that also incorporates a premonitory focus required to generate investigative leads. This project demonstrated the critical importance of fusing firearms forensic evidence such as ballistics imaging with locally available information, such as arrest and incident data on a statewide basis. This study further demonstrated the value of ballistics imaging to connect previously unconnected incidents, individuals, and weapons particularly when combined with other law enforcement data sets. This project demonstrated the critical importance of fusing firearms forensic evidence such as ballistics imaging with locally available information, such as arrest and incident data on a statewide basis. This study further demonstrated the value of ballistics imaging to connect, previously unconnected incidents, individuals, and weapons particularly when combined with other law enforcement data sets. It illustrated the critical need of information sharing across forensic, criminal intelligence (such as fusion and real time crime centers), and investigative entities across all levels of government – local, state, and federal - in supporting violent crime suppression efforts. The study is a mixed methods approach to policy analysis using both quantitative and qualitative analysis. The researchers’ analyzed ballistics imaging submissions over a multi-year period in addition to examining open source and agency documents that tracked many of the crime reduction projects the New Jersey State Police incorporated into their crime gun intelligence effort.

Boston: Northeastern University, 2023. 120p.

Extreme risk protection orders, race/ethnicity, and equity: Evidence from California

By V A Pear , J P Schleimer , A J Aubel , S Buggs , C E Knoepke , R Pallin , A B Shev , E Tomsich , G J Wintemute , N Kravitz-Wirtz

Extreme risk protection orders (ERPOs) provide a civil mechanism to temporarily remove firearm access from individuals at high risk of harming themselves or others. Evidence and theory suggest that ERPOs can prevent firearm-related harm, but the policy's impact on racial/ethnic equity is largely unknown. To examine potential inequities by race/ethnicity in public perceptions and use of California's ERPO law, we drew on two complementary data sources: 1) a 2020 state-representative survey of California adults, and 2) ERPO court documents for the first 3 years of policy implementation (2016-2018). Majorities (54-89%) of all racial/ethnic groups reported that ERPOs are at least sometimes appropriate, and 64-94% were willing to ask a judge for an ERPO for a family member. However, Black and Hispanic/Latinx survey participants less often perceived ERPOs as appropriate and were less willing to serve as petitioners, with Black participants citing lack of knowledge about ERPOs and not trusting the system to be fair as their top reasons for unwillingness. Similarly, review of ERPO court documents revealed that no family or household members served as petitioners for Black and Hispanic/Latinx ERPO respondents. Additionally, Black respondents were the least likely to have documented access to a firearm and legal representation in court. Racial/ethnic equity in ERPO use may be improved by reducing barriers to petitioning, incorporating non-law enforcement intervention professionals like behavioral health specialists into the ERPO process, providing legal assistance to respondents and petitioners, and investing in the social safety net.

Prev Med. 2022 Dec;165(Pt A):107181. doi: 10.1016/j.ypmed.2022.107181. Epub 2022 Aug 6. PMID: 35940474.

The Contours of the Gun Industry Impunity: Separation of Powers, Federalism, and the Second Amendment

By Hillel Y. Levin & Timothy D. Lytton

In 2005, Congress passed the Protection of Lawful Commerce in Arms Act (PLCAA), granting the firearms industry sweeping immunity from civil lawsuits. However, PLCAA immunity is not absolute. This Article demonstrates that both state and federal courts have fundamentally misread PLCAA when adjudicating cases involving the scope of gun industry immunity. Properly understood, PLCAA permits lawsuits against the gun industry so long as they are based on statutory causes of action rather than common law. While broadly preempting state common law claims, PLCAA affords state legislatures autonomy in deciding how to regulate the gun industry within their borders.

Additionally, this Article addresses unresolved questions concerning constitutional limits on gun industry regulation. PLCAA explicitly strikes a balance between three constitutional principles. It safeguards the individual right to keep and bear arms by protecting the gun industry from civil litigation that would unduly curtail civilian access to firearms. It insists that the separation of powers requires that gun industry regulation should derive from legislation not common law adjudication. It affords state governments autonomy in deciding how to regulate the gun industry, recognizing that there are regional differences in attitudes about how to best reduce firearms-related violence. We counsel against interpretations of the Second Amendment’s application to gun industry regulation that would expand the right to keep and bear arms at the expense of other important constitutional principles such as the separation of powers and federalism

75 Florida Law Review 833 (2023),

Washington State Assault Weapon Firearm Violence Before and After Firearm Legislation Reform

By Avneet Bhullar, Jonathan Shipley, […], and Jeffry Nahmias, , et al,

Background

In January of 2019, Washington State (WA) passed Initiative 1639 making it illegal for persons <21 years-old to buy assault weapons (AWs). This study aimed to evaluate the effects of WA-1639 on firearm-related incidents involving AWs by those <21 years-old in WA, hypothesizing a decrease in incidents after WA-1639.

Methods

Retrospective (2016-2021) data on firearm violence (FV) events were gathered from the Gun Violence Archive. The rate of FV was weighted per 100,000 people. Total monthly incidents, injuries, and deaths were compared pre-law (January 2016-December 2018) vs post-law (January 2019-December 2021) implementation. Mann-Whitney U tests and Poisson’s regression were used for analysis.

Results

From 4091 FV incidents (2210 (54.02%) pre-law vs 1881 (45.98%) post-law), 50 involved AWs pre- (2.3%) and 15 (.8%) post-law. Of these, 11 were committed by subjects <21 years-old pre-law and only one occurred post-law. Total incidents of FV (z = −3.80, P < .001), AW incidents (z = −4.28, P < .001), and AW incidents involving someone <21 years-old (z = −3.01, P < .01) decreased post-law. Additionally, regression analysis demonstrated the incident rate ratio (IRR) of all FV (1.23, 95% CI [1.10-1.38], P < .001), all AW FV incidents (3.42, 95% CI [1.70-6.89], P = .001), and AW incidents by subjects <21 years-old (11.53, 95% CI [1.52-87.26], P = .02) were greater pre-law vs post-law.

Discussion

Following implementation of WA-1639, there was a significant decrease in FV incidents and those involving AWs by individuals <21 years-old. This suggests targeted firearm legislation may help curtail FV. Further studies evaluating FV after legislation implementation in other states is needed to confirm these findings.

The American SurgeonTM. 2024;0(0). doi:10.1177/00031348241244644 (Online First)

Structural racism and Long-term Disparities in Youth Exposure to Firearm Violence

By Jonathan Jay

Young people’s exposure to firearm violence in US cities has surged during the COVID-19 pandemic.1,2 This study by Lanfear and colleagues3 examines how long-term changes in firearm violence have influenced exposure across multiple birth cohorts in Chicago, Illinois. Comparing 4 cohorts from the Project on Human Development in Chicago Neighborhoods (PHDCN), Lanfear et al3 find that any benefits younger cohorts might have from declines in citywide violence from 1994 to 2014 were erased by subsequent violence increases. The results underscore how little progress we have made over several decades to address the root causes of community firearm violence and its disproportionate effects on Black and Hispanic youth.

In the study by Lanfear and colleagues,3 the youngest PHDCN cohort, born around 1996, entered adulthood after a sustained lull in firearm homicide rates in Chicago (ie, 2004-2014). This lull limited the cohort’s exposure to neighborhood experiences of firearm violence, such as seeing someone get shot, during early life. However, these youth were in the highest-risk phase of adolescence (ages 18-24 years) when firearm violence spiked in 2016 and again in 2020.3 Consequently, their cumulative risk of being shot was comparable to cohorts born earlier, including those who entered adolescence during the most violent years of the 1990s.3

Exposure to firearm violence is associated with lasting consequences for youth and their loved ones. Indirect exposure (eg, witnessing violence) and direct exposure (eg, surviving an assault) can influence mental and physical health outcomes over the life course. In a subset of individuals, exposure is associated with the future enactment of firearm violence, feeding cycles of firearm violence at the community level. The increase in firearm violence during the COVID-19 pandemic is likely to have long-term outcomes because it substantially increased both indirect1 and direct2 exposure among US youth. Therefore, it is crucial to continue scaling up public health programs to halt the violence surge and deal with its aftermath, especially through community-based outreach programs and trauma-informed services.

At the same time, efforts must directly target the systemic inequities that concentrate firearm violence exposure among Black and Hispanic youth. Racial and ethnic disparities in these outcomes are profound and longstanding. In the study by Lanfear et al,3 differences in firearm violence exposure by race were more extreme than differences between birth cohorts. By the end of the study period, exposure was roughly comparable across age cohorts but exposure was consistently lowest among White youth. Other recent work, such as a 2023 study by Jay et al,2 reported that during the pandemic, Black children were 100 times, and Hispanic children 25 times, more likely than White children to be shot in Chicago and other major US cities.

These staggering disparities demand action against structural racism as a driver of firearm violence. Incremental violence reductions, such as those experienced by many US cities from the mid-1990s through mid-2010s, are necessary and life-saving but also precarious, as recent spikes have shown. There is no consensus among scholars on the reasons for the long-term declines in violence, but it is evident that these declines did not fundamentally disrupt the racial inequities that determine who is at the most risk of being shot or witnessing a shooting: even as homicide rates declined in Chicago, violence was increasingly concentrated in predominantly Black neighborhoods.4

Although community violence had been gradually declining, Black and Hispanic youth remained pervasively exposed to societal inequities. Child poverty in the US peaked in the early 2010s, with more than one-quarter of Black and Hispanic children living below the federal poverty line.5 Meanwhile, policy makers emphasized punitive responses, such as aggressive policing and harsh sentencing, even for nonviolent offenses. Black and Hispanic communities bore the brunt of these policies. In Chicago, for example, mass incarceration “hot spots” emerged, mainly in Black neighborhoods on the South and West sides. There were 851 “million dollar blocks,” where the costs of incarcerating residents from these areas exceeded $1 million, from 2005 to 2009 alone.6 Such massive investments in punishment necessarily came at the expense of community investments that might have helped close racial and ethnic gaps in child opportunity.

This disinvestment from basic needs likely explains why Black and Hispanic youth experienced the largest change in violence exposure during the COVID-19 pandemic. When violence increased during the pandemic, it increased fastest in the neighborhoods most burdened by racial segregation and economic deprivation,7 where COVID-19 deaths, economic losses, and other stressors were most severe. Firearm violence exposure among White youth mostly remained low during the pandemic, suggesting that the 2020 spike was not inevitable, but rather a byproduct of the social and economic vulnerability produced by sociopolitical forces, such as long-term disinvestment.

Addressing racial and ethnic disparities in youth exposure to firearm violence requires not only interrupting cycles of violence, but interrupting cycles of racialized disinvestment and punitive policy-making. Community investments at the micro level, such as improving the physical condition of abandoned properties, have been shown to reduce nearby firearm violence8; at the macro level, the federal Child Tax Credit caused child poverty to plummet in 2021.5 Policies to reduce residential racial segregation, such as inclusionary zoning, are also likely necessary to close gaps in the long term. There was not much change in firearm violence exposure for youth born between the early 1980s and late 1990s in Chicago—and until we remove the structural barriers to community safety, this change is unlikely to come.

JAMA Network Open, 2023;6(5):e2312425. doi:10.1001/jamanetworkopen.2023.12425

Firearms and Drugs: Partners in Transnational Crime

By The United Nations Office on Drugs and Crime (UNODC) and the Flemish Peace Institute

The multifaceted links between illicit drug trafficking and illicit firearms present a global challenge requiring a clear understanding and integrated responses. These multidimensional links are characterized by:

  • the demand for firearms that is created by the trafficking of illicit drugs, not least as drug traffickers are heavily armed with illicitly trafficked weapons;

  • the connection between firearms and drug trafficking routes, actors and modi operandi, with drug traffickers accepting or demanding firearms as payment-in-kind for illicitly trafficked drugs;

  • gun violence that occurs as a direct result of the ability of drug traffickers to increase their capabilities through accessing a wide variety of illicitly trafficked firearms.

Drug trafficking fuels firearms trafficking

Global drug trafficking acts as a key driver for the use of illicit firearms as well as their illicit manufacturing, proliferation, and trafficking. The long life cycle of firearms provides opportunities for the diversion of firearms from legal possession into illegal possession. Drug criminals across the globe profit from such diversion opportunities and the affiliated firearms trafficking activities.

Firearms seizures in the context of drug trafficking occur on a global scale and are particularly prominent in Europe, Latin America and the Caribbean. Firearms trafficking is often funded by the profits generated by illicit drug trafficking, with direct exchanges of firearms for drugs taking place in certain instances.

Demand for firearms is high in a drug-related criminal context due to the instrumental and reputational purposes that a firearm fulfils for actors involved in drug trafficking activities. Access to firearms allows drug criminals to carry out or expand their activities and protect their territory and themselves against competitors and law enforcement agencies.

Similar routes, actors and modi operandi in both types of trafficking

While drug trafficking is characterized by a global reach and firearms trafficking is generally limited to a regional dimension, significant interlinkages arise between both types of trafficking through the actors, routes and modi operandi used by the traffickers. Arms trafficking methods have often been pioneered by drug traffickers.

Frequently, firearms and drugs are smuggled together, or the firearms can be used as a means of protection for drug traffickers from both competitors and/or public security forces.

Global drug trafficking routes can also be exploited for firearms trafficking as firearms can be smuggled in the reverse direction or on the same drug trafficking route and incorporate the same facilitators and/or collaborators to successfully smuggle the contraband.

Drug trafficking fuels gun violence

Despite the largely non-violent dimension of the illicit drug trade, as most illicit drugs transactions and trafficking occur without violence, the linkages between firearms and drug trafficking can trigger, facilitate and intensify violence. Access to trafficked firearms tends to increase the use of violence in drug markets across the globe, with more lethal casualties and higher levels of the use of automatic rifles being associated with the drug milieu than with other criminal contexts.

Drug-related gun violence is a global phenomenon and can occur at any point within the drug lifecycle. Significant geographical differences can be observed in gun violence related to the production and trafficking of large quantities of drugs, which reflect to a certain extent the global distribution patterns of the various types of drugs. Drug-related gun violence connected to local consumer drug markets, on the other hand, can be observed across the globe.

Gun violence related to drug trafficking can have devastating spill-over effects on local communities and, geographically, in the broader region in which drug trafficking occurs. The interlinkages between firearms and drug trafficking can fuel armed conflict and terrorism by facilitating the funding and acquisition of weapons by non-state armed groups and terrorists through drug trafficking criminal networks and activities.

Vienna: UNODC, 2024. 52p.

The Cycle of Violence: Neighborhood Concerns as a Mediator between Childhood Maltreatment and Gun Violence

By Sophie L. Kjærvik, Victoria J. Blondell, Nicholas D. Thomson

Gun violence remains a persistent public health issue in the United States. Two notable risk factors for violence include childhood maltreatment and exposure to community violence. Yet, little is known about the link between childhood maltreatment and gun violence in adulthood and whether a lack of community safety (i.e., increased firearm presence and violence) may explain the association. Objective: This study aimed to investigate the relationship between childhood maltreatment (i.e., emotional abuse and neglect, physical abuse and neglect, and sexual abuse) and firearm violence while examining the potential mediating role of neighborhood concerns among adults hospitalized with violent injuries. Participants and setting: The study included 329 violently injured adults (Mage = 32.7) recruited from a Level 1 Trauma Center in Virginia. Methods: Participants completed assessments of childhood maltreatment, neighborhood concerns, and firearm violence. Results: All forms of childhood maltreatment, except for emotional neglect, were related to firearm violence. Neighborhood concerns partially mediate the relation between both emotional abuse and physical abuse and firearm violence and fully mediate the relation between both sexual abuse and physical neglect and firearm violence. The results show the critical importance of addressing both individual-level trauma and broader social determinants of health (i.e., community violence) in violence prevention efforts. Conclusion: By understanding the pathways through which childhood maltreatment manifests in community settings and contributes to firearm violence, the findings offer valuable insights for informing targeted interventions and policy initiatives aimed at reducing the prevalence of firearm-related violence and fostering safer neighborhood

Unpublished paper, 2024. 43p.

Aggravating Circumstances: How coronavirus impacts human trafficking

By Livia Wagner and Thi Hoang

   The coronavirus is not only claiming hundreds of thousands of lives, but is also causing a global economic crisis that is expected to rival or exceed that of any recession in the past 150 years. Although decisive action and containment measures are helping flatten the curve of infection, such measures inevitably deepen and lengthen the economic recession. In the worst-case scenario, the International Labour Organization (ILO) estimates that up to 25 million people will lose their jobs worldwide. Poverty, lack of social or economic opportunity and limited labour protections are the main root causes and drivers that render people vulnerable or cause them to fall victim to human trafficking. This unprecedented crisis will likely exacerbate all of those factors and result in developments (see Figure 1) that must be noted by anti human-trafficking communities and stakeholders.  

Geneva:  Global Initiative Against Transnational Organized Crime. 2020, 41pg

Firearm Contagion: A New Look at History

By Rachel Martin

Gun violence is widely considered a serious public health problem in the United States, but less understood is what this means, if anything, for evolving Second Amendment doctrine. In New York Pistol & Rifle Association, Inc. v. Bruen, the Supreme Court held that laws infringing Second Amendment rights can only be sustained if the government can point to sufficient historical analogues. Yet, what qualifies as sufficiently similar, a suitable number of jurisdictions, or the most important historical eras all remain unclear. Under Bruen, lower courts across the country have struck down gun laws at an alarming pace, while scholars and jurists continue debating the so-called true meaning of centuries-old firearm restrictions at times when slavery existed, women could not vote, and it took Thomas Jefferson longer to travel from Washington, D.C. to Williamsburg, VA than it currently takes to fly to the other side of the planet. This approach ignores the historical relevance of the government’s authority, if not outright duty, to respond to public health crises even if constitutional rights were implicated. The lack of historical laws related to mass shootings, large capacity magazines, and bullets designed to expand inside the body reflects the drastic evolution of gun violence rather than an impenetrable Second Amendment scope. Indeed, while state police powers to protect public health and safety preexist the Constitution, gun violence would have hardly been a priority for elected officials historically. Thus, the absence of robust, widespread gun regulations hardly reflects a consensus understanding of Second Amendment protections. Instead, examining accepted government restrictions for public health crises such as infectious diseases may provide better insight into the scope of authority to limit constitutional rights to protect the public. A public health law lens also helps to clarify that cementing policy options to emerging public health problems lacks historical pedigree.

Fordham Urban Law Journal, Vol. 51, No. 1, 2023, 20pg

Persistent Perils: Illicit MANPADS in the MENA Region

By Matt Schroeder

Since 1970, armed groups have hit dozens of civilian aircraft with man-portable air defence systems (MANPADS), killing more than 1,000 civilians. The international community has taken numerous steps to reduce illicit proliferation, but armed groups in the Middle East and North Africa (MENA) region continue to acquire and use these systems.

Persistent Perils: Illicit MANPADS in the MENA Region—a new Report from the Small Arms Survey’s Security Assessment In North Africa (SANA) project—provides an in-depth analysis of the proliferation of MANPADS in North Africa and the Middle East from 2015–23. Drawing on imagery and data collected since 2015 to identify the type, model, generation, and country of design/manufacture of illicit MANPADS in the region, the Report assesses the implications of recent proliferation patterns for regional security and international norms and agreements.  

Geneva: Small Arms Survey. 2024, 68pg

50 State Actions to Reduce Gun Violence  

By Gary Klein

In light of the difficulty achieving consensus about gun violence prevention at the federal level in the current political climate, leadership and innovation on gun violence prevention must come at the state and local levels. State legislators, law enforcement leaders, and state attorneys general must take the lead to find the pathway that most effectively protects their residents in collaboration with concerned communities. There is substantial evidence that states with comprehensive and effective gun laws have fewer incidents of gun homicides, gun suicides, and unintentional shooting deaths. These 50 proposals for state or local action have demonstrated success where they have been enacted and are a starting point for states interested in promoting public safety by addressing preventable gun violence.  

Washington, DC: Violence Policy Center, 2022. 24p.

Mass Shootings in the United States Involving Large Capacity Ammunition Magazine

By The Violence Policy Center

Large capacity ammunition magazines are the common thread running through most mass shootings in the United States. Since 1980, there have been at least 106 mass shootings (three or more fatalities not including the shooter) where the shooter used large capacity ammunition magazines containing more than 10 rounds. A total of 959 people were killed in these shootings, and 1,309 were wounded. This number is likely a significant undercount of actual incidents as there is no consistent collection or reporting on this data. Even in many high-profile shootings, information on magazine capacity is neither released nor reported. The Violence Policy Center has compiled this list of incidents by analyzing news reports and follow-up investigative reports on mass shootings. Only shootings in which there is specific information that large capacity magazines were used are included.  ( This document was last updated on January 11, 2024.

Washington, DC: Violence Policy Center, 2024. 17p. 

The Addiction Restriction: Addiction and the Right to Bear Arms

By F. Lee Francis

This article is the culmination of a yearlong research project, and it is the first to address addiction and drug use in the area of Second Amendment Law. I argue that addicts may be disarmed, if they are dangerous. My dangerousness test centers on illicit use and imminent danger. That is, do the facts and circumstances prove that an individual is in fact a danger. To put it another way, disarmament is appropriate when there exists demonstrable evidence that a person poses a significant and imminent risk of causing public injury. The article develops and expands upon some themes and arguments that were first sketched out in my articles, Armed and Under the Influence: The Second Amendment and the Intoxicant Rule After Bruen (Forthcoming in the Marquette Law Review (2024) and Defining Dangerousness: When Disarmament is Appropriate (Forthcoming Texas Tech Law Review 2024).

There is growing confusion within the lower courts regarding when an individual, particularly those who have a history of drug use or addiction, may have their Second Amendment rights restricted. This paper intends to clarify the appropriate standard. The goal of this article is to aid in determining when an individual should be permanently disarmed.

Part I surveys the history of addiction. This section examines the commonness of addiction around the time of the founding to the early twentieth century. Furthermore, Part I also reviews the relevant legislative action relating to firearm possession, use, and control and addiction. The essential claim of Part I contends that modern laws restricting the possession of a firearm due to addiction are unconstitutional. Following an examination of the relevant history and legislation, Part II considers the arguments in favor of prohibiting addicts from possessing firearms. Part III focuses on the modern and developing controversies surrounding criminalizing the possession of firearms because of an individual’s history of addiction. Part IV, then, examines when an addict may be disarmed.

Francis, F. Lee, The Addiction Restriction: Addiction and the Right to Bear Arms. 2024, 48pg

Analysis of Daily Ambient Temperature and Firearm Violence in 100 US Cities

By: Vivian H. Lyons, Emma L. Gause, Keith R Spangler, et al.

Importance: Firearm violence is a leading public health crisis in the US. Understanding whether and how ambient temperature is associated with firearm violence may identify new avenues for prevention and intervention.

Objective: To estimate the overall and regional association between hotter temperatures and higher risk of firearm violence in the US.

Design, setting, and participants: This cross-sectional study used distributed lag nonlinear models, controlling for seasonality and long-term time trends by city and pooled results overall and by climate region. The most populous cities in the US with the highest number of assault-related firearm incidence (ie, shootings) from 2015 to 2020 were analyzed. Data analysis was performed from October 2021 to June 2022.

Exposures: Maximum daily temperature by city.

Main outcomes and measures: The primary outcome was the number of assault-related firearm shootings by city.

Results: A total of 116 511 shootings in 100 cities were included in this analysis. The pooled analysis estimated that 6.85% (95% CI, 6.09%-7.46%) of all shootings were attributable to days hotter than city-specific median temperatures. This equates to 7973 total shootings (95% CI, 7092-8688 total shootings) across the 100 cities over the 6-year study period, although the number of total persons injured or killed would be higher. Estimated risk of firearm incidents increased almost monotonically with higher temperatures, with a local peak at the 84th percentile of the temperature range corresponding to a relative risk of 1.17 (95% CI, 1.12-1.21) compared with the median temperature. However, even moderately hot temperatures were associated with higher risk of shootings. Although significant, there was low heterogeneity between cities (I2 = 11.7%; Cochran Q test, P = .02), indicating regional or climate-specific variation in the daily temperature and incident shootings relationship.

Conclusions and relevance: These findings underscore the importance of heat adaptation strategies broadly throughout the year to reduce shootings, rather than focusing on only the hottest days.

JAMA Netw Open. 2022 Dec 1;5(12):e2247207. doi: 10.1001/jamanetworkopen.2022.47207. PMID: 36525273; PMCID: PMC9856408.

Gunshot Detection: Reducing Gunfire through Acoustic Technology

By Dennis Mares

This document is part of the Response Guide series which is one of three series in the Problem-Oriented Guides for Police series. Response guides summarize knowledge about whether police should use certain responses to address various crime and disorder problems, and about what effects they might expect. This guide include examples and case studies as it covers the basic principles of gunfire detection and how it works; discusses the efficacy and police uses of acoustic gunshot detection systems, describing types of systems, experimental applications of the technology, and accuracy of acoustic gunshot detection systems; describes the analysis of acoustic gunshot detection system data; recommends best practices for responding to gunshots; and gives advice for implementing acoustic gunshot detection system, noting considerations such as coverage area, costs, personnel needs, interoperability with other systems, training requirements, and other factors that may impact decision-making.

PROBLEM-ORIENTED GUIDES FOR POLICE RESPONSE GUIDE SERIES NO. 14 Tempe, AZ: ASU Center for Problem-Oriented Policing, 2022. 29p

Evaluation of Gunshot Detection Technology to Aid in the Reduction of Firearms Violence

By Daniel S. Lawrence, Nancy G. La Vigne, Paige S. Thompson

This publication represents a technical summary report of the Urban Institute’s evaluation of the implementation, use, and impact of Gunshot Detection Technology (GDT) by law enforcement agencies in three cities: Denver, CO; Milwaukee, WI; and Richmond, CA. The goal of this study was to conduct a rigorous process and impact evaluation of GDT to inform policing researchers and practitioners about the impact GDT may have. To achieve this goal, we implemented a mixed-methods research design. Qualitative data collection included 46 interviews with criminal justice stakeholders to learn implementation processes and challenges associated with iDT, and 6 focus groups with 49 community members to learn how residents feel about policing efforts to reduce firearm violence and its use of GDT. Quantitative data collection included administrative data on calls for service (CFS), crime, and GDT alerts, as well as comprehensive case file reviews of 174 crimes involving a firearm. Quantitative analyses examined the impact of GDT by (1) comparing counts of gunshot notifications for GDT alerts to shooting-related CFS, (2) comparing response times of GDT alerts to shooting-related CFS, (3) examining the impact GDT has had on CFS and crimes, and (4) conducting a cost-benefit analysis of the GDT. Evaluation findings suggest that GDT is generally but not consistently associated with faster response times and more evidence collection, with impact on crime more uneven but generally cost-beneficial. We also conclude that agencies should implement GDT sensors strategically, train officers thoroughly, ensure that GDT data are used and integrated with other systems, and engage with community members early and often. More detailed information from this study will be available in forthcoming journal articles.

Washington, DC: Urban Institute 2019. 15p.

A Cost-Benefit Analysis of Shotspotter in Winston-Salem, NC: Improving the Police Response to Gunfire

By Dennis Mares and the Center for Crime Science and Violence Prevention

ShotSpotter’s gunshot detection system was deployed in Winston-Salem in August 2021. Since then, nearly 2,000 alerts received a response by Winston-Salem Police.

Results indicate: 

  • Improved response to gunfire

    • The response to alerts is significantly quicker than those called in by residents (- 5 min.).

    • ShotSpotter calls received significantly more investigative time, which likely indicates improved evidence recovery.

    • Fewer than one in four ShotSpotter alerts also received a call from residents.

  • ShotSpotter produces the following actionable results:

    • Shell casings were recovered in 581 incidents (37.1%)

    • Firearms were recovered in 47 (3%) of alerts.

    • Sixty-seven (3.4%) gun-related arrests are connected to alerts. 

  • Deployment of ShotSpotter is related to a reduction in violent gun crimes:

    • Aggravated assaults are down 26% comparing before-after results in the ShotSpotter area.

    • Comparable area and overall city numbers indicate an increase in aggravated assaults during the same period. Comparatively assaults are down 38% in the ShotSpotter community.

    • In real numbers, there are between 51-75 fewer assaults annually in the ShotSpotter area than would be expected. 

  • Cost-Benefits:

    • Our estimate suggests that ShotSpotter may save the Winston Salem community between $5 and $8 Million annually.

    • Average annual implementation cost is estimated between $230,000-350,000

    • This indicates a $15-25 return for each dollar spent.

Edwardsville, IL: Southern Illinois University, Center for Crime Science and Violence Prevention, 2024. 27p.

The effect of gunshot detection technology on evidence collection and case clearance in Kansas City, Missouri

By Eric L. Piza, Rachael A. Arietti, Jeremy G. Carter & George O. Mohler

Objectives

This study tests whether (1) shots fired calls for service in the gunshot detection technology (GDT) target area are more likely to be classified as unfounded; (2) police responses to shootings in the GDT target area are more likely to recover ballistic evidence or firearms; and (3) shootings in the GDT target area are more likely to be cleared.

Methods

Entropy balancing created a weighted control group that equaled the treatment group across a range of covariates. GDT effect was tested through logistic regression models with entropy balancing weights set as probability weights.

Results

Shots fired occurring in the GDT target area were 15% more likely to be classified as unfounded compared to control cases. GDT did not significantly influence the likelihood of evidence collection or case clearance in shooting incidents.

Conclusions

GDT may not add investigative value to police responses to shooting incidents and may increase patrol workload.

J Exp Criminol (2023). https://doi.org/10.1007/s11292-023-09594-6

Gunshot Detection Technology Time Savings and Spatial Precision: An Exploratory Analysis in Kansas City

By Eric L. Piza, David N. Hatten, Jeremy G. Carter, Jonas H. Baughman, George O. Mohler

Gunshot Detection Technology (GDT) is expected to impact gun violence by accelerating the discovery and response to gunfire. GDT should further collect more accurate spatial data, as gunfire is assigned to coordinates measured by acoustic sensors rather than addresses reported via 9-1-1 calls for service (CFS). The current study explores the level to which GDT achieves these benefits over its first five years of operation in Kansas City, Missouri. Data systems are triangulated to determine the time and location gunfire was reported by GDT and CFS. The temporal and spatial distances between GDT and CFS are then calculated. Findings indicate GDT generates time savings and increases spatial precision as compared to CFS. This may facilitate police responses to gunfire events and provide more spatially accurate data to inform policing strategies. Results of generalized linear and multinomial logistic regression models indicate that GDT benefits are influenced by a number of situational factors.

Policing: A Journal of Policy and Practice. https://doi.org/10.1093/police/paac097 , 2023 38p.