This is odd. I know this was around 9-11 but it seems to me, like the article said, it would be difficult to make it without being detected.
The anthrax was really easy to make when they wanted to frame a guy, Hatfill, who clearly had no ability to refine the stuff.
This time it’s “highly refined” and because Ivins actually dealt with anthrax...well, story is unsure. Was there silica present?
The only clear thing—the FBI was sa incompetent its primary goal was to fight shining any light on their actions. A few weeks ago some retired agents expressly called the investigation incompetent.