NPR's "This American Life" did a show, to see what they could find out. (Link includes podcast and transcript.) Magazine story with more details.
I'm just going to underline one bit-- FBI policy is to shuffle people who are peripherally connected to possible terrorist plots out of the country if at all possible.... the FBI doesn't do this to people who are giving them information. In other words, they're exiling people who are more likely to be harmless, and keeping the people who are more likely to be dangerous around.
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