The whole quote from the affidavit:
http://www.usdoj.gov/amerithrax/07-524-M-01%20attachment.pdf“…Both of the anthrax spore powders recovered from the Post and Brokaw letters contain low levels of a bacterial contaminant identified as a strain of Bacillus subtilis. The Bacillus subtilis contaminant has not been detected in the anthrax spore powders recovered from the eenvelopes mailed to either Senator Leahy or Senator Daschle. Bacillus subtilis is a nonpathogenic bacterium found ubiquitously in the environment.
However, genomic DNA sequencing of the specific isolate of Bacillus subtilis discovered within the Post and Brokaw powders reveals that it is genetically distinct from other known isolates of Bacillus subtilis. Analysis of the Bacillus subtilis from the Post and Brokaw envelopes revealed that these two isolates are identical.
Phenotypic and genotypic analyses demonstrate that the RMR-1029 does not have the Bacillus subtilis contaminant found in the evidentiary spore powders, which suggests that the anthrax used in the letter attacks was grown from the material contained in RMR-1029 and not taken directly from the flask and placed in the envelopes. Since RMR-1029 is the genetic parent to the evidentiary spore powders, and it is not known how the Bacillus subtilis contaminant came to be in the Post and Brokaw spore powders, the contaminant must have been introduced during the production of the Post and Brokaw spores. Taken together, the postmark dates, the Silicon signature, the Bacillus subtilis contaminant, the phenotypic, and the genotypic comparisons, it can be concluded that, on at least two separate occasions, a sample of RMR-1029 was used to grow spores, dried to a powder, packaged in an envelope with a threat letter, and mailed to the victims….”
Unless the Government can identify the isolate of Bacillus subtilis in the Post and Brokaw letters — again which according to the Government is UNKNOWN — and tie it to Ivins, they got no case.