The FBI has stated that evidence points to microbiologist Bruce Ivins as the sole person responsible for five deaths in 2001. In July, Ivins committed suicide as the government was preparing to indict him.
David Kestenbaum, NPR's science correspondent, talks about the investigation, and Rep. Rush Holt (D-NJ) explains why he has been an outspoken critic of the way the case has been handled.
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