The primary objection to the use of polygraph tests for lie detection is that

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The primary objection to the use of polygraph tests for lie detection is that they misidentify too many honest people as liars. This is because the tests measure physiological responses that may be triggered by anxiety, rather than by lying. As a result, people who are anxious or nervous during the test may be wrongly accused of lying, while skilled liars may be able to control their physiological response and pass the test.

The Primary Objection to the Use of Polygraph Tests for Lie