Between 1994 and 2004, the federal assault weapons ban prohibited the sale and manufacture of certain military-style semiautomatic weapons and high-capacity magazines in the US. A study in JMIR Public Health and Surveillance now suggests that the ban not only prevented an estimated 5 public mass shootings during those 10 years, but would have averted many more between 2005 and 2022 if it had stayed in place instead of being allowed to expire.

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