In the first study, published in 2014, the group used police homicide statistics to focus mainly on Missouri, and, after extensive tracking, “estimated” that the repeal of Missouri’s PTP law was associated with an increase in annual firearm homicides rates of 1.09 per 100,000 (+23%) but was unrelated to changes in non-firearm homicide rates… the law’s repeal was associated with increased annual murders rates of 0.93 per 100,000 (+16%). These estimated effects translate to increases of between 55 and 63 homicides per year in Missouri. These claims built on an earlier paper by Webster, which
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