There have been contradictory reports on that. The fact that Stevens got inhalation anthrax and that the anthrax was widely distributed (even if it hopped a ride on a mail cart or copy paper ream) tell you it was weaponized, unlike the brown, granular anthrax sent to the NYC media outlets, which caused only non-life-threatening cutaneous anthrax. That is, in itself, rather remarkable, because it makes AMI even more of an odd-man out in the media-directed letter campaign. Why send lethal anthrax to a Boca Raton tabloid, but innocuous granular anthrax to the New York media? I believe the resolution to that question is provided by the fact that the AMI hit was a completely separate leg of the anthrax campaign -- it came from the 9-11 hijackers themselves, and was mailed before 9-11 as a kind of sick joke calling card from Mr. Atta. The two New Jersey waves were to remind us that the sleepers are still here, and they still have "THIS ANTHRAX."