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School drills that simulate school shootings
Chris Hayes talks to NBCNews.comreporter Nona Willis Aronowitz about her report: Fake Blood and Blanks: Schools Stage Active Shooter Drills.
The inexplicable weirdness of Rick Scott04:31
Bad news for some blue state GOP governors05:30
Leaks from the Mike Brown investigation surface07:27
Amazing video of Ottawa post office evacuation01:35
Who was the Ottawa gunman?07:38
Shooting attack in Ottawa stuns Canada16:11