Based on the scientific principles underlying the assessment of 'lie detector' tests, evaluate the polygraph results in the following scenario and justify your conclusion.

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The validity and accuracy of polygraph tests are highly questionable. A major criticism is the lack of scientific evidence showing that lying is associated with any single, distinct pattern of physiological arousal. This means that physiological responses measured by the polygraph, such as an increased heart rate, could be caused by other emotions like anxiety or surprise, not necessarily dishonesty.

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