Apparently the previous "We have proof" conference

didn't settle the questions on the case against Bruce Ivins.
Growing doubts from scientists about the strength of the government’s case against the late Bruce E. Ivins, the military researcher named as the anthrax killer, are forcing the Justice Department to begin disclosing more fully the scientific evidence it used to implicate him.

In the face of the questions, Federal Bureau of Investigation officials have decided to make their first detailed public presentation next week on the forensic science used to trace the anthrax used in the 2001 attacks to a flask kept in a refrigerator in Dr. Ivins’s laboratory at Fort Detrick, in Maryland. Many scientists are awaiting those details because so far, they say, the F.B.I. has failed to make a conclusive case.

Be interesting to see what the experts say after the stuff is released.