School shootings

There have been 99 swatting incidents so far this school year, which take a toll on school resources and mental health.

School security is an estimated $3 billion industry, including things like training, armed officers, and video cameras. But there’s little evidence on what’s actually effective.

Because gun control measures haven't gone far, schools are investing in security, says The 74's Mark Keierleber. Those measures come with significant costs.

John Woodrow Cox of The Washington Post explains how a 1996 legal provision effectively halted research on gun violence.