I heard the stat as "firearm discharges in a school," which struck me as being a bit contrived, but still not exactly a good thing. Regardless of what's being shot or why, there really shouldn't be any sort of shooting going on at a school (rifle clubs aside, which are a tightly controlled exception that can't in any way be compared to the statistic cited here).
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This is my signature. It exists to keep people from skipping the last line of my posts.

The 18 school shootings in the US this year narrative was apparently fake news.

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