This takes particular courage, because the Feds threatened to indict another researcher if they couldn't make the case against Bruce E. Ivins stick.
The New York Pravda comes right out and says it:
...If Dr. Ivins did not make the powder, one conceivable source might be classified government research on anthrax, carried out for years by the military and the Central Intelligence Agency. Dr. Ivins had ties to several researchers who did such secret work...
Secret and entirely against international law, since the bugs were weaponized.