Need To Know

Nine Years After: 9/11

Nine years after 9/11 we investigate a law enforcement policy known as “preemptive prosecution,” a technique to combat so-called homegrown terrorism. Then, we meet a filmmaker, Alex Gibney, who chronicles a reporter Lawrence Wright's journey to find the roots of Islamic terror. The film is called “My Trip to Al Qaeda.” Plus, an update on the rebuilding at ground zero.

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