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Polygraphs Detect Stress Not Lies
- Polygraphs measure real physiological stress responses rather than lying itself.
- That stress signal is not specific to deception, so the test cannot reliably prove truthfulness.
Marston: Inventor Of The Systolic Test
- William Moulton Marston developed a systolic blood pressure lie detector and later created Wonder Woman.
- His life mixed psychology, law, and controversial personal behavior that shaped his inventions.
High Sensitivity, High False Positives
- Polygraphs show high sensitivity for detecting stress when someone lies but also produce many false positives.
- Because innocent people get stressed by questioning, the polygraph risks convicting the innocent more than protecting the guilty.