The investigation into the anthrax attacks that started in 2001 and mystified the nation ended in June for the FBI, when its prime suspect committed suicide. For others, the case leaves many questions unanswered.

“I tend to be very skeptical about it,” Michael Greenberger, director of the Center for Health and Homeland Security at the University of Maryland School of Law, said of the FBI’s case against the late Bruce Ivins.

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