It was widely reported the FBI was about to lay charges on him , but the evidence was largely circumstantial and the grand jury in Washington reported it was not ready to issue an indictment .
Ivins was a top U.S. biodefense researcher .
It was widely reported the FBI was about to lay charges on Ivins , but the evidence was largely circumstantial and the grand jury in Washington reported it was not ready to issue an indictment .
Ivins was a top U.S. biodefense researcher .