From the February 27 NY Times … More problematic is the investigative work that led the F.B.I. to conclude that only Dr. Ivins, among perhaps 100 scientists who had access to the same flask, could have sent the letters. The case has always been hobbled by a lack of direct evidence tying Dr. Ivins to the letters. No witnesses who saw him prepare the powdered anthrax or mail the letters. No anthrax spores in his house or car. No incriminating fingerprints, fibers or DNA. No confession to a colleague or in a suicide note, just opaque ramblings in e-mail that the F.B.I. interprets as evidence of guilt. The agency’s 92-page report sets forth a mass of circumstantial evidence that points to Dr. Ivins. He worked alone in the laboratory at night and on weekends just before the mailings, outside his usual pattern. He often made long drives to mail letters from distant post offices using pseudonyms. Although he was a vaccine expert, not a weapons expert, he apparently had the skill and equipment to produce the highly purified spores used in the letters. That conclusion in particular ought to be validated by independent analysis. The cumulative weight of the evidence seems persuasive

Original Source of The FBI’s Anthrax Case/ NYT