did you notice the part where Frontline researchers had come across the original document that had been redacted from public view? It had to do with a (positive?) sample that Ivins had identified based on "Dugway Ames Spores". It's not clear to me the point being made in this section of the program, but they also mentioned 4 samples from the RMR-1029 flask being sent to the FBI and coming back negative. Interviewer: "How can this be?" Interviewee: "Exactly!".

It seems apparent that the government possibly wanted to keep USAMRID's relationship with Dugway secret and, perhaps, Ivins (when he was at first collaborating with the FBI investigation) may have discovered something incriminating?