investigative scrutiny included:
* A physician who told associates that’s/he was one of the few people who could have prepared and mailed the anthrax letters. A preliminary investigation suggested that this individual possessed a financial motive for committing the crime and possessed knowledge of anthrax dispersal techniques.
* A scientist, although deceased for more than a year prior to the mailing of the anthrax letters, reported to have possessed chemical and biological materials of interest, and who may have been closely associated with key figures from a biological weapons program in a foreign country.
* A researcher with access to the Ames strain who possessed a keen interest in the weapons application of the Ames strain, biological terrorism scenarios, and biological warfare in general.
* A researcher with access to the Ames strain who possessed particular expertise in the fermentation production of bacteria.
* A scientist with an arguable financial motive to commit the attacks, who traveled to New Jersey at or near the time of the New York and Washington, D.C. anthrax mailings.
* A scientist with access to the Ames strain who trained others in the refinement and weaponization of biological agents.
* A foreign-born researcher who worked at a facility maintaining the Ames strain and against whom an anonymous letter had been sent to law enforcement alleging that’s/he had strong anti-American sentiments and may have had access to “biological poisons.”
* A foreign-born scientist with particular expertise working with a Bacillus anthracis simulant known as Bacillus subtilis, and against whom there were allegations that’s/he had connections with several individuals affiliated with the al-Qaeda and Ansar al-Islam terrorist networks.
* A microbiology student who allegedly had associations with al-Qaeda’s anthrax program.
* A foreign-born scientist who published certain microbiology articles that were found at an al-Qaeda training facility in a foreign country.
* A foreign-born microbiologist in New Jersey who had allegedly made certain anti-American statements, and who lived and worked in close proximity to Princeton.
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