If the FBI cannot place Ivins at the scene of the crime (the Princeton mailbox) on the required dates, then who cares what sorority houses might be near the mailbox? The sorority angle becomes irrelevant, since he did not mail the letters in Princeton.
Remember, this is one of the most complex, expensive cases in the FBI's history. So after spending hundreds of thousands of man-hours on the case, you can be sure the FBI has also figured out that the sorority angle leads nowhere. Yet the documents the FBI released yesterday place great emphasis on Ivins' obsession with kappa kappa gamma sorority. The only explanation is the FBI's desire to publicly sully Ivins' character, not solve the case.
The FBI has been unable to provide a sensible explanation for how Ivins' testing for anthrax contamination outside the biosafety suites implicates him, when they found not a spore in his home or car. Fort Detrick has a long history of anthrax contamination (which led to the death of an electrician, Joel E. Willard, 50 years ago). Many anthrax samples were brought to Detrick for testing after the letters were sent. Why weren't the halls and other areas formally tested for contamination after all that traffic? The FBI spent a lot of time showing Ivins to be an obsessive guy: but when his obsessive testing of the Detrick facility found contamination, the FBI blamed him for producing it, rather than for detecting it. And Ivins' testing and cleaning occurred many months after the letters were sent.
The FBI claims that Ivins deliberately gave them improper samples, tried to put the blame on another scientist, gave them scads of false information. But we have only their word on this. Why wasn't the polygraph evidence released?
Why has the special preparation of the spores become such an area of confusion and disinformation? Because there was no way Ivins could have obtained the recipe, and the FBI is doing its darnedest to plug the holes in its case?
For an FBI desperate to get this case closed; an FBI that told Ivins' children their dad was a mass murderer and offered his son a $2.5 million reward to turn his dad in; an FBI that may have deliberately hounded Ivins because he looked like he would crack, thus obligingly closing their case; it's the objective evidence that's missing. Can we trust the FBI's morass of subjectivity?