title: Association Between Connecticut's Permit-to-Purchase Handgun Law and Homicides.
abstract: OBJECTIVE
  We sought to estimate the effect of Connecticut's implementation of a handgun permit-to-purchase law in October 1995 on subsequent homicides.
  
  
  METHODS
  Using the synthetic control method, we compared Connecticut's homicide rates after the law's implementation to rates we would have expected had the law not been implemented. To estimate the counterfactual, we used longitudinal data from a weighted combination of comparison states identified based on the ability of their prelaw homicide trends and covariates to predict prelaw homicide trends in Connecticut.
  
  
  RESULTS
  We estimated that the law was associated with a 40% reduction in Connecticut's firearm homicide rates during the first 10 years that the law was in place. By contrast, there was no evidence for a reduction in nonfirearm homicides.
  
  
  CONCLUSIONS
  Consistent with prior research, this study demonstrated that Connecticut's handgun permit-to-purchase law was associated with a subsequent reduction in homicide rates. As would be expected if the law drove the reduction, the policy's effects were only evident for homicides committed with firearms.
authors.affiliation: Kara E. Rudolph is with the School of Public Health, University of California, Berkeley; Center for Health and Community, University of California, San Francisco; and Department of Mental Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD. Elizabeth A. Stuart is with the Departments of Mental Health and Biostatistics, Bloomberg School of Public Health. Jon S. Vernick and Daniel W. Webster are with the Center for Gun Policy and Research, Bloomberg School of Public Health.
authors.forename: Kara E
authors.initials: KE
authors.lastname: Rudolph
authors.affiliation: Kara E. Rudolph is with the School of Public Health, University of California, Berkeley; Center for Health and Community, University of California, San Francisco; and Department of Mental Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD. Elizabeth A. Stuart is with the Departments of Mental Health and Biostatistics, Bloomberg School of Public Health. Jon S. Vernick and Daniel W. Webster are with the Center for Gun Policy and Research, Bloomberg School of Public Health.
authors.forename: Elizabeth A
authors.initials: EA
authors.lastname: Stuart
authors.affiliation: Kara E. Rudolph is with the School of Public Health, University of California, Berkeley; Center for Health and Community, University of California, San Francisco; and Department of Mental Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD. Elizabeth A. Stuart is with the Departments of Mental Health and Biostatistics, Bloomberg School of Public Health. Jon S. Vernick and Daniel W. Webster are with the Center for Gun Policy and Research, Bloomberg School of Public Health.
authors.forename: Jon S
authors.initials: JS
authors.lastname: Vernick
authors.affiliation: Kara E. Rudolph is with the School of Public Health, University of California, Berkeley; Center for Health and Community, University of California, San Francisco; and Department of Mental Health, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD. Elizabeth A. Stuart is with the Departments of Mental Health and Biostatistics, Bloomberg School of Public Health. Jon S. Vernick and Daniel W. Webster are with the Center for Gun Policy and Research, Bloomberg School of Public Health.
authors.forename: Daniel W
authors.initials: DW
authors.lastname: Webster
mesh_terms: D003237:Connecticut / Q000453:epidemiology; D005389:Firearms / Q000331:legislation & jurisprudence*; D006708:Homicide / Q000706:statistics & numerical data*; D006801:Humans; D014481:United States / Q000453:epidemiology; D014948:Wounds, Gunshot / Q000401:mortality