You've heard parts of this story in every report of a teacher preying on a vulnerable student. What makes this case different is the sheer scale of the abuse. Nearly twenty years, dozens of students ... how did it go on for so long?

Michael Gregory could have been stopped before most of this happened. But he wasn't. What can this horrific case teach us about protecting children from systematic abuse in the school system?

GUEST: Omar Mouallem, writer, editor, and filmmaker. (You can read Omar's piece in Maclean's right here.)

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