New Evidence Adds Doubt to FBI’s Case Against Anthrax Suspect
by Stephen Engelberg, ProPublica, Greg Gordon, McClatchy, Jim Gilmore and Mike Wiser, PBS Frontline Oct. 11, 2011, 12:05 a.m.

WASHINGTON – Months after the anthrax mailings that terrorized the nation in 2001, and long before he became the prime suspect, Army biologist Bruce Ivins sent his superiors an email offering to help scientists trace the killer.

Already, an FBI science consultant had concluded that the attack powder was made with a rare strain of anthrax known as Ames that's used in research laboratories worldwide.
In his , Ivins volunteered to help take things further. He said he had several variants of the Ames strain that could be tested in “ongoing genetic studies" aimed at tracing the origins of the powder that had killed five people. He mentioned several cultures by name, including a batch made mostly of Ames anthrax that had been grown for him at an Army base in Dugway, Utah.