One year ago, Maine experienced the worst mass shooting in its history. It turned out many people and institutions had known for months before that the shooter, Robert Card, was in a mental health crisis and heavily armed. One friend even alerted authorities that Card might “snap and commit a mass shooting.” Despite that knowledge — and the state’s “yellow flag” gun law — 18 people were killed. Emotional testimony from an official investigation reveals the failures in a system designed to prevent this kind of violence — and how they might be avoided in the future.

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