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FD-302a (Rev. 10-6-95) Continuation ofFD30206 [| Cn 04/18/2007 Page 3 eS volunteered that could have also mailed the anthrax letters using anthrax obtained from the lab’s aerosol challenges.[— __] explained the mechanics of an anthrax challenge. The anthrax is suspended in a fluid placed in the plexiglass container containing the animal. Compressed air creates a mist containing the anthrax inside the animal’s container. Upon completion of a challenge, the container is wiped out and the collected anthrax is disposed of.