The Hunt for the Anthrax Killer.

Examines the investigation into Dr. Steven J. Hatfill, a scientist who once worked in one of the U.S. Army's bioweapons-research laboratories, as the possible 2001 anthrax killer. Background on Hatfill, who complained for years that the U.S. was not doing enough to prepare for a potential bioterrorist attacks; Decision of the authorities to question him after he failed a polygraph while applying for a job at the Central Intelligence Agency; Need for U.S. investigators to find physical evidence to charge someone; Outlook.