A polygraph test is administered to people to determine the truth or falsehood of statements. These tests are typically not thought to be fool-proof, but as technology has improved, they have come to be thought of as a useful and reliable indicator of truth. The technology measures changes in the body when questions are posed to a person and those changes are correlated to existing research and data connecting certain bodily changes with the stress of lying. The polygraph test is usually administered by police personnel. The law typically does not require people to submit to the procedure, though many often volunteer to do so in order to prove their innocence.

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