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The Untold Story with Martha McCallum, exclusive interviews with top newsmakers who share their inspiring

stories of perseverance, positivity, and more. Now, here's Martha McCallum. Last year, 17 innocent

lives were lost in the shooting at Marjorie Stoneham Douglas High School in Parkland, Florida.

Now, Andrew Pollock, who lost his daughter

Meadow that day, calls it the most avoidable mass murder in American history. Pollock says the movement

toward anti-discipline and leniency for troubled students that was forged under the Obama

administration presents a real threat to students today and enabled Meadow's

killer to slip through the cracks. He writes about it in his new book, Why Meadow died, the people

and policies that created the Parkland shooter and endanger America students. He joins me now to

share his untold story, Andrew, we've been talking

over the course of the last year and a half, two years, I guess, almost now. And this, what you

are doing and the dedication that you've given to this is so much broader than the way most

people are approaching this problem. Let's start with your premise here,

that it was the most avoidable school shooting in history-wide. Because there were so many

warning signs from when he was even in nursery school, to middle school, to everything that

this kid ever did, his mental health, the FBI, you know, the multitude of failures

...