(NEWSER) – As head of security for public schools in Fairfax County, Va.—the nation's 10th largest school district—Tom Vaccarello is responsible for the safety of 189,000 kids in 196 schools. It's a big job: Each academic year, he tells the Washington Post, schools in his district receive some 100 threats … about one every other day.

"I protect 189,000 presidents now," says Vaccarello, a former Secret Service member. "We can't be complacent." However, he tells the Post, balancing student safety with minimizing disruptions is a difficult task. After all, most threats are not credible. Still, as threats made against schools increase—up 158% from 2013 to 2014, one expert tells the San Jose Mercury News—more and more school officials across the US are being forced to strike that balance.

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