Until the end of last week, investigators hunting for the anthrax killer had just three pieces of forensic evidence: the anthrax-tainted letters sent to NBC anchor Tom Brokaw, the New York Post and Senator Tom Daschle. The discovery of a fourth letter, this one sent to Senator Patrick Leahy, a Vermont Democrat, and the probable existence of a fifth, sent to the State Department, could revitalize a case that has seemed in danger of stalling. The Leahy letter was unopened and had yet to be irradiated, which should give epidemiologists the ability to trace the lineage of the spores inside. The...
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