It seems we’re going to be discussing anthrax in detail again. And in anticipation of those discussions, I wanted to challenge the notion that the circumstantial evidence against Ivins remains strong.
The whole case depends on the FBI’s contention that a flask Ivins had–RMR-1029–was “the murder weapon.” But in fact, the FBI only has proof that Ivins had what might be one of eight or more potential precursors to the murder weapon. Their efforts to equate the two ignore some interim steps about which they seem to have little evidence (and what they have they’re not examining very closely).
So here’s my summary of the circumstantial case against Bruce Ivins. (Jim White gave me a ton of scientific help with this, but the errors surely result from my own misunderstanding.)
When US Attorney Jeff Taylor announced FBI was closing the investigation in February 2010, he gave the following 7 pieces of evidence that Ivins was the culprit.
First, we were able to identify in early 2005 the genetically-unique parent material of the anthrax spores used in the mailings. As the court documents allege, the parent material of the anthrax spores used in the attacks was a single flask of spores, known as “RMR-1029,” that was created and solely maintained by Dr. Ivins at USAMRIID. This means that the spores used in the attacks were taken from that specific flask, regrown, purified, dried and loaded into the letters. No one received material from that flask without going through Dr. Ivins. We thoroughly investigated every other person who could have had access to the flask and we were able to rule out all but Dr. Ivins.
Second, as a renowned expert in the production and purification of anthrax spores, Dr. Ivins was one of a handful of scientists with the capability to create spores of the concentration and purity used in the attacks. The affidavits allege that, not only did Dr. Ivins create and maintain the spore batch used in the mailings, but he also had access to and experience using a lyophilizer. A lyophilizer is a sophisticated machine that is used to dry pathogens, and can be used to dry anthrax. We know others in Dr. Ivins’ lab consulted him when they needed to use this machine.
Third, in the days leading up to each of the mailings, the documents make clear that Dr. Ivins was working inordinate hours alone at night and on the weekend in the lab where the flask of spores and production equipment were stored. A review of his access records revealed that Dr. Ivins had not spent this many “off hours” in the lab at any time before or after this period. When questioned about why he was in the lab during these off hours prior to each of the mailings, Dr. Ivins was unable to offer any satisfactory explanation.
Fourth, the affidavits indicate Dr. Ivins had engaged in behavior and made a number of statements that suggest consciousness of guilt. For example, one night shortly after a search warrant was executed on his house, Dr. Ivins took highly unusual steps to discard a book and article on DNA coding while under 24/7 surveillance. In addition, he had submitted a questionable sample of anthrax from his flask of parent spores to the FBI, presumably to mislead investigators. He had also made far-reaching efforts to blame others and divert attention away from himself, and had made threatening e-mail statements to a friend regarding the case. Recently, he had detailed threats in his group therapy session to kill people who had wronged him, after learning he might be indicted.
Fifth, as reflected in the court documents, Dr. Ivins had a history of mental health problems and was facing a difficult time professionally in the summer and fall of 2001 because an anthrax vaccine he was working on was failing. The affidavits describe one e-mail to a co-worker in which Dr. Ivins stated that he had “incredible paranoid, delusional thoughts at times,” and feared that he might not be able to control his behavior.
Sixth, throughout his adult life Dr. Ivins had frequently driven to other locations to send packages in the mail under assumed names to disguise his identity as the sender. He had also admitted to using false names and aliases in writings. In addition, he was a prolific writer to Congress and the media, the targeted victims in the anthrax attacks. Law enforcement recovered 68 letters to such entities from his house in a Nov. 1, 2007 search.
I’ll conclude with one more point. The envelopes used in the attacks were all pre-franked envelopes, sold only at U.S. Post Offices during a nine-month window in 2001. An analysis of the envelopes revealed several print defects in the ink on the pre-printed portions of the envelopes. Based on the analysis, we were able to conclude that the envelopes used in the mailings were very likely sold at a post office in the greater Frederick Maryland, area in 2001. Dr. Ivins maintained a post office box at the Post Office in Frederick, from which these pre-franked envelopes with print defects were sold.
Here’s what remains of each of these 7 pieces of evidence:
1. The spores in the attack came from RMR-1029 and Ivins controlled access to that flask
The certainty of this claim was seriously challenged by both the National Academy of Sciences report and subsequent reporting on several grounds.
First, the NAS study concluded only that the genetic analysis was consistent with the spores being derived from RMR-1029.
The results of the genetic analyses of the repository samples were consistent with the finding that the spores in the attack letters were derived from RMR-1029, but the analyses did not definitively demonstrate such a relationship.
That only says that whoever prepared the (probable) two separate batches of anthrax may have started with anthrax obtained at some point from that flask. NAS holds out the possibility the anthrax producer may have gotten it from somewhere else, that it was possible to get similar genetic results from other means (that is, suggesting that’s not the only way to have produced the samples found in the letter).
An even bigger problem is the complete lack of attention on what happened to the anthrax after it came from Ivins’ flask, if it did. The NAS later emphasizes this interim step.
The flask designated RMR-1029 was not the immediate, most proximate source of the letter material. If the letter material did in fact derive from RMR-1029, then one or more separate growth steps, using seed material from RMR-1029 followed by purification, would have been necessary. Furthermore, the evidentiary material in the New York letters had physical properties that were distinct from those of the material in the Washington, D.C. letters.
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