You can produce a very good grade of anthrax powder in the lab.

On October 15, 2001, Rouse was the Daschle staff member to call the police about a letter that contained anthrax powder.

Next time it might not be hijacked planes and traces of anthrax powder.

But the biologist insisted that the student was beyond reproach and would have no idea how to make an advanced anthrax powder.

Early in 2002, it was noted that there were variants or mutations in the anthrax powders from the attacks.

Vegetative cells in dry anthrax powder are generally dead and therefore harmless, experts said.

"I know of no case of the United States saying that it has made anthrax powder," she said.

Yet in comprising up to one trillion spores, a gram of anthrax powder has vast potential to kill.

Today, no terrorist or scientific maverick is known to have published anything that comes close to describing how to make concentrated anthrax powders.

They find anthrax powder and a newspaper with one of the adverts deciphered, and then Ivery arrives.