The FBI now admits that it can't infiltrate Al Qaeda with undercover agents. Well.... DUH!! This really shouldn't surprise anyone.
My cause is just, after all. I mean, what could be more noble than the killing of innocent, unarmed civilians on a beautiful, sunny morning, who are sitting at their desks drinking coffee and reading that morning's "Dilbert?" My followers realize that, and that knowledge in turn inspires great devotion among those that wish to martyr themselves. Well, that, and the thing with the 72 naked, horny virgins tends to help as well. So any potential undercover agents would quickly be seduced by our benefits package.
Plus, guys speaking Arabic with a Georgia accent tend to stick out around here.