Sullivan said he decided to start the polygraph tests after taking one himself when he was hired.

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Current workers at Fort Detrick are being given polygraph tests by the FBI to see if any leads may materialize.

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Currently, many scientists who are knowledgeable about anthrax are taking polygraph tests and undergoing interviews as investigators try to uncover suspects.

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Justice Department attorneys conducted interviews with Huang over 20 days and he took several polygraph tests before the deal was made, the sources said.

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The nine remaining agents took polygraph tests, and although none of them failed, some responses led to the loss of several jobs, he added.

CNN: STORY HIGHLIGHTS

Ray took two polygraph tests and both times, examiners concluded he killed King and acted alone, though experts, of course, disagree about the worth of such tests.

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After college he went to work conducting polygraph tests.

FORBES: Up From Ground Zero

He suggested one possibility would be more polygraph tests.

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Will key witnesses take polygraph tests?

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U.S. Secret Service officials told lawmakers Thursday they are arranging polygraph and drug tests for employees implicated in an alleged prostitution scandal, and additional ousters are expected in coming days.

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He worked on improving the efficiency of the polygraph the lie detector and conducted some 15, 000 tests with the instrument.

ECONOMIST: Robert Borkenstein