State laws requiring background checks or cooling-off periods for buying firearms are effective at reducing gun deaths, Princeton University researchers have revealed in a study this week.Scholars Patrick Sharkey and Megan Kang found that stricter passed by 40 states from 1991 to 2016 cut gun deaths by nearly 4,300 in 2016.That's roughly 11 percent of all gun deaths that year, the most recent period for which data are available.
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