Someone had questioned on another thread whether Atta would be involved in both the hijackings and the anthrax. If al-Haznawi and someone else doing the mailings after 9/11 were both involved, then Atta could be the link.
The ONLY reason this isn't the "official" thoery is that it means Iraq (or maybe Iran) reached out and touched us with a WMD and we did not erase their sorry asses from the face of the Earth.
"Trident kills anthrax dead."