noun
- machines that measure and record physiological responses (such as blood pressure, pulse, and breathing) to determine if someone is telling the truth; lie detectors
Examples
- The FBI uses polygraphs to screen potential employees.
- Police departments often rely on polygraphs during criminal investigations.
- The suspect agreed to take a polygraph test to prove his innocence.
- Modern polygraphs can detect subtle changes in heart rate and breathing.
- The results from polygraphs are not always admissible in court.
- Security agencies use polygraphs to verify the truthfulness of statements.