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According to one government database, the U.S. has had at least one shooting on K-12 school properties every March from 2003 through 2009, and every March since (but not including) 2010.
What’s False
However, the way that various U.S. government agencies and organizations define a “school shooting” varies greatly, making any numerical claims problematic. Also, by the standards of one key government database, the U.S. had eight — not zero — school shootings in March 2020.