States that have weakened their firearm permitting system have experienced a 13-15 percent increase in violent crime rates.

John J. Donohue, Abhay Aneja, and Kyle D. Weber, “Right-to-carry Laws and Violent Crime: A Comprehensive Assessment Using Panel Data and a State-Level Synthetic Control Analysis,” Journal of Empirical Legal Studies 16, no. 2 (2019): 198-247, https://doi.org/10.1111/jels.12219.