April 20, 2011 5:11 PM

Was FBI too quick to judge anthrax suspect the killer?

Scouring the anthrax-laced mail that took five lives and terrorized the East Coast in 2001, laboratory scientists discovered a unique contaminant — a tiny scientific fingerprint that they hoped would help unmask the killer. Yet once FBI agents concluded that the likely culprit was Bruce Ivins, they stopped looking for the contaminant. That decision could reignite the debate over whether its agents found the real killer.

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