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THE FBI has a good idea who might be the “anthrax attacker” who sent contaminated letters though the US postal system last year, killing five and panicking a nation. But it has decided, for now, not to arrest him.

That’s the claim of leading bioweapons expert Barbara Rosenberg from the Federation of American Scientists, who has also been one of the strongest critics of the federal investigation into the attacks. “Either the FBI is under pressure from [government agencies] not to proceed because the subject knows too much,” she says in an analysis being circulated on the Internet this week, “or the FBI really is as…

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