The DNA linked the anthrax used in the mailing to a flask used in Bruce Ivins' lab at the U.S. Army Medical Institute of Infectious Diseases, said the source, who was not authorized to speak publicly about the case.Maybe so, though I am awfully tired of all these "unauthorized" sources who talk anyway.
But guess what? Choosing strains is an old trick well known to those in biodefense. Perpetrators specifically select a strain that will throw suspicion on someone else. And scientists share all these strains. Back in 2001, no one knew how many labs had Ames anthrax. And now the FBI plans to indict based on Ivins' mix of strains? Anyone can mix strains.
Bottom line: this proves very little.