Excerpt from original story in The Oregonian indicates extensive contacts and debriefs between Haigwood and the FBI over 6 years. Although agents were close-mouthed with almost everyone else during this investigation, they apparently opened their case files for Dr. Haigwood:
A Nature interview with Dr. Haigwood is here.
"Haigwood, who researches HIV transmission and vaccines, said she contacted the FBI shortly after the American Society for Microbiology asked its members in 2002 to think of possible suspects in the anthrax case. Agents soon interviewed her and have stayed in touch off and on ever since, she said.
FBI officials told her of their plans to accuse Ivins and of his suicide before the news broke, and they will debrief her more in the coming weeks, she said.
Haigwood said FBI agents were "very ethical and above board." And reading their case files convinced her they have the right suspect. "The evidence was compelling," she said.
"I have a tremendous sense of relief, I must say," that Ivins is gone, she said. "But also tremendous sadness. Because I always hoped I was wrong."'