Yes dry spore powders can be and are produced in BL3 and BL2.
But this is aerosolized anthrax (like smoke).
I don’t have anything to add to the expert’s conclusion other than to note that his lab is in the business of making aerosolized anthrax simulant and so he is definitely qualified as an expert. TR can forward the SEMS of my friend’s simulant if TR still has them. I’ve noted my non-expert view that the unipolar charge was not added until after insertion into the envelope.
But both could be true.
I find it more notable that a key expert has argued that the FBI knows full well a lyophilizer could not be used to make the Daschle / Leahy product.
I think any expert who has not actually attempted to make an aerosolized anthrax simulant, in court, would run the risk of a motion to strike their testimony on the grounds they are not expert on the subject.
I haven no idea whether the unnamed person at Ft. Detrick who is the LA Times source (and apparently accuses Ivins) is expert on the subject — has made powdered anthrax simulant. Who has at Ft. Detrick, which is a vaccine research facility. Ezzell? I have no idea.