This is a pack of lies
The FBI have persecuted three scapegoats so far - the last Ivins killed himself. At every stage the FBI has been looking for a 'lone' killer. In the same way that NIST is determined to prove that 'fires' brought down World Trade Centre 7. Put another way - Forensic science in the US must not unearth facts which can be tracked back to government initiated conspiracies and especially when the events ease the paths of pre-determined government intentions.
So the anthrax wasn't 'weoponized'? first of all two sets of letters were sent containing different grades of anthrax. The first caused 12 cases of infection, the second 10.
However the first caused 3 cases of inhalation infection, the second, 8 cases of inhalation infection (80% as opposed to 25%). The second batch of letters was sent to Senators Daschle and Leahy who both by coincidence were the main opponents of the Patriot Act. Result: Patriot Act passed, Cheney happy, the US a police state. So to tidy the loose ends, a scapegoat, preferably dead
Look at the Wiki entry on the attacks and research the Patriot Act.