Even Level 1 is tricky here. Ames strain anthrax did come from the U.S.A., of course. It was isolated from a dead cow in Texas, now the second most famous cow in history (the first being Mrs. O'Leary's cow which did not start the Great Chicago Fire).
Presumably when people say that the anthrax did not come from the U.S.A, they mean that a sample was brought from the U.S.A. to another country, where it was cultured and weaponized; also that it was delivered by foreign agents in support of some foreign military or terrorist purpose.
Mitchell, You have been listing to Vic too much. Can you name ONE citation for Ames with 35 A's outside of the US that matches the attack Ames? I susspect Vic will not want to discuss this from a science point of view, because there is NO DATA.
How about from a media point of view. Have you read one citation of Ames with 35 A's outside of the US? I didn't think so.
I should have been more precise.
Rephrase that:
1. The spores did not come from the USA.