You saw the anthrax simulant expert’s opinion they were loaded wet and then it was dried, right? If so, and if it is feasible, why doesn’t that suffice? Load it. Put it in a plastic bag. You’re done. No muss. No fuss.
I can’t find it now — must have deleted it — but I did get another opinion from a biothreat analyst (former government; PhD) who said if microencapsulation were done, a BL-4 would be necessary. But when I showed him the opinion of the fellow who makes the stuff, he said it was the best opinion he’s seen. (That was the fellow who said it could be loaded wet and then evaporated). Then upon being put in a plastic bag, it’s done. As you know, I distinguish between those who make the stuff (even if just simulant) and those who don’t. I’ll ask him to ask Ken next weekend.