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Metadata Surveillance Didn't Stop the Paris Attacks

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French soldier, Arc de Triomphe

A French soldier enforcing the Vigipirate plan, France's national security alert system, patrols in front of the Arc de Triomphe on Nov. 16, 2015 in Paris.

Credit: Joel Saget/AFP/Getty Images

Since terrorists struck Paris last Friday night, the debate over whether encryption prevents intelligence services from stopping attacks has reignited.

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