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Glen, you mention that Ivins might be "the" anthrax attacker. A quick analysis of the notes included with the anthrax gives a suggestion (strong?) that the writer of the notes had some military background. I've seen no mention of any military background in Ivins' case (there was with Hatfill).
The suggestion here is that, possibly, Ivins did not act alone (if he did, in fact, act in the crime). If a military, or former military, person wrote the notes, that person probably would not have had the experience to handle the anthrax, and that's where Ivins (or some other scientific type) would enter.