Secret Service on preventing mass shootings

December 21, 2012 4:22 PM

The U.S. Secret Service has spent years studying assassins and school shooters to develop ways to prevent mass shootings. Scott Pelley speaks with Brian Vossekuil and Robert Fein, who wrote two studies for the Service and say that gunmen typically leave a lot of clues about their intentions.

The warning signs for a potential school shooter

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