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St. Paul, Minn.

The science of lying

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Lie detector tests
Sports walker Bernardo Segura, left, takes a lie detector test October 9, 2000 in Mexico City, Mexico. The Mexican athlete was disqualified for running in the 20km walk at the Sydney 2000 Olympic Games and lost the gold medal.
Photo by Susana Gonzalaz/Liasion
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Lie detector tests
Sports walker Bernardo Segura, left, takes a lie detector test October 9, 2000 in Mexico City, Mexico. The Mexican athlete was disqualified for running in the 20km walk at the Sydney 2000 Olympic Games and lost the gold medal.
Photo by Susana Gonzalaz/Liasion