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Lie-detector demonstration

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Lie-detector test

Description

Dr. J. B. Dalton demonstrating a lie-detector machine to Olivia Johnson, St. Paul Police Department, ca. 1935. Photograph by the St. Paul Daily News.

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Minnesota Historical Society

More Information

http://collections.mnhs.org/cms/display.php?irn=10742695

Articles

St. Paul Police Department Reform, 1933–1940

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Science and Technology

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