Last school year, 4 million students were on lockdown
Clip: 01/27/2019 | 4m 38s
During the last school year, more than 4 million students participated in at least one lockdown, most often in response to a perceived gun or violent threat, a Washington Post report found. And these perceived threats, psychologists say are causing students trauma. Reporter John Woodrow Cox joins Hari Sreenivasan for more.
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