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http://www.usatoday.com/news/nation/2003-05-28-anthrax-usat_x.htm "...It's an uneasy alliance because investigators wonder whether the killer could be one of the scientists working on the probe. Hatfill was one of 30 to 40 U.S. scientists the FBI believes had access to anthrax and the expertise to work with it.
One of the law enforcement sources says investigators sometimes wonder whether they focused on Hatfill too soon, and ignored someone who deserved more attention.
So much has gone into investigating Hatfill, the source says, that abandoning the focus on him "would be like starting all over."