This is unusual because most research done and published by the medical establishment has an extreme bias against civilian firearm possession, and thus they usually construct a data analysis of cherry-picked locations and time frames that will produce the result they seek: "more guns means more crime". In this case however they looked at all states for a 30 year period, thus they "discovered" that "liberalizing" (i.e.following the Constitution re bearing arms) concealed carry laws had no effect whatsoever on crime rates. While that makes a good case for our side, it also doesn't support any notion that as the percentage public that carry increases means a lowering of the crime rate. What it does mean, of course, is that people who previously would have been crime victims due to being disarmed in public at least now have a fighting chance of not becoming victims. This study didn't measure that, and can't, but that fact is invaluable to those who would have been victimized.
Anyone think the legislators here will give this study any weight?

From the Journal of the American College of Surgeons.
State Level Firearm Concealed-Carry Legislation and Rates of Homicide and Other Violent Crimehttps://www.journalacs.org/article/S1072-7515(18)32074-X/fulltextResultsDuring the study period, all states moved to adopt some form of concealed-carry legislation, with a trend toward less restrictive legislation. After adjusting for state and year, there was no significant association between shifts from restrictive to nonrestrictive carry legislation on violent crime and public health indicators. Adjusting further for poverty and unemployment did not significantly influence the results.
ConclusionsThis study demonstrated no statistically significant association between the liberalization of state level firearm carry legislation over the last 30 years and the rates of homicides or other violent crime. Policy efforts aimed at injury prevention and the reduction of firearm-related violence should likely investigate other targets for potential intervention.
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Here's Dean Weingarten's brief article on the study:
https://www.ammoland.com/2018/12/new-study-no-relationship-ccw-homicide-violent-crime/#axzz5Zafio2x2