To Tell the Truth.

Discusses investigations at the United States Federal Bureau of Investigation (FBI) and Department of Energy, prompted by the arrest of FBI agent Robert Hanssen and unproven spy allegations against physicist Wen Ho Lee. Damage done by counterintelligence investigations at the Central Intelligence Agency (CIA) after the arrest of double spy Aldrich Ames; Question of whether polygraphs are helpful in such investigations; How the agencies must guard national security, but not at the expense of agents' individual rights. INSET: Pandora's box.