The most famous bioterrorist episode of recent times has been the series of anthrax-laced envelopes mailed from Trenton, New Jersey in September and October 2001 to various newspaper and government offices. In spite of enormous media coverage and painstaking investigation by the FBI, aided by hundreds of thousands of tips from the public and by dozens of teams of scientific researchers, thus far neither the Anthrax Mailer himself (or, against all supposition, herself) nor the source of the anthrax has been identified. In its investigation of the anthrax mailing case, the FBI has relied heavily on specialists. While specialized knowledge...