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Can you give us a brief summary of Prof. Chomsky's take on this, or the interview in general? Just a few hints, perhaps?
Several people were commenting on the forensic handwriting analysis aspect of the case. I found two links to Board (ABFDE) and Court Ccertified. independent Forensic Document Examiners.
These brief but professional analyses were done some time ago, based on what was publicly available, but I'm not sure when. I thought you might like to take a look. Perhaps you have access to others I've missed.
http://iwhome.com/spectrum/crevnts.htm
http://www.richardfrasermd.com/anthraxletters.html