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Since Sandy Hook, thousands of armed officers have been employed in schools. There's no evidence it makes a difference

Duration: 03:01
Since Sandy Hook, an estimated 20,000 armed officers have been employed in schools across the US. Yet, there's no evidence it has made a difference. CNN's Tom Foreman reports.

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Officers stand outside Robb Elementary School in Uvalde, Texas, on May 25, 2022. - A tight-knit Latino community in Texas was wracked with grief Wednesday after a teen in body armor marched into an elementary school and killed 19 small children and two teachers, in the latest spasm of deadly gun violence in America. (Photo by allison dinner / AFP) (Photo by ALLISON DINNER/AFP via Getty Images)

Since Sandy Hook, thousands of armed officers have been employed in schools. There's no evidence it makes a difference

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