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August 7, 2008 9:02 PM

Three key questions still unanswered in anthrax case

While the FBI says it's certain Bruce Ivins is the person who setn anthrax spores through the mail to news media and government officials, there are still key questions that are unanswered. One of the most disturbing is, if Ivins was the mentally troubled person the FBI portrays, how did he remain in his sensitive government position, with access to dangerous bio materials, for so long?

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