School shootings are less likely in states with background check laws, higher mental health and K-12 education expenditure, and with greater per cent urban population, finds researchers based on statistical analyses of school shooting incidents during 2013-2015 in the USA.

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School shootings are less likely in states with background check laws, higher mental health and K-12 education expenditure, and with greater per cent urban population, finds researchers based on statistical analyses of school shooting incidents during 2013-2015 in the USA.