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I have a post at Achieving Our Country where I take a first look at the genetics and other technical information linking the attack material to Ivins. I find more questions than answers.
It's still not clear from what is said in the warrant whether the attack material was treated with sophisticated materials to render it more deadly. It is clear that Ivins referred to the key flask by two names, RMR-1029 and "Dugway Ames Spores - 1997", so there is a very good chance the flask came from Dugway.
The key questions then revolve around who produced the material in that flask, how it was processed, where it was produced, and, if it was produced at Dugway, does the flask in Ivins' control represent all of the material produced in that batch?