Bruce Edwards Ivins , a scientist at the government 's biodefense labs at Fort Detrick in Frederick , Maryland , became Becoming a focus around April 4 , 2005 .

On April 11 , 2007 , Ivins was put Placing under periodic surveillance and an FBI document stated Statement that he was `` an extremely sensitive suspect in the 2001 anthrax attacks Judgment_communication '' .

On July 29 , 2008 , Ivins committed Killing suicide Killing with an overdose of acetaminophen .

Federal prosecutors declared Expressing_publicly Ivins the sole culprit on August 6 , 2008 , based on DNA evidence leading to Causation an anthrax vial in his lab .

The report cast doubt on the government 's conclusion that Ivins was the perpetrator , finding Know that the type of anthrax used in the letters was correctly identified Check as the Ames strain of the bacterium , but that there was insufficient scientific evidence for the FBI 's assertion that it originated Coming_to_be from Ivins 's laboratory .

The report cast doubt on the government 's conclusion that Ivins was the perpetrator , finding Know that the type of anthrax used in the letters was correctly identified Check as the Ames strain of the bacterium , but that there was insufficient scientific evidence for the FBI 's assertion that it originated Coming_to_be from Ivins 's laboratory .

The FBI responded by pointing out that the review panel asserted Statement that it would not be possible to reach Achieve a definite conclusion based on science alone , and said Statement that a combination of factors led the FBI to conclude Statement that Ivins had been the perpetrator .

Some information is still sealed concerning the case and Ivins 's mental problems .