Which of the following statements about polygraphs is most accurate?

Question

Quizplus · Accepted Answer

While there is some evidence to suggest that polygraphs can detect physiological changes that accompany lying, these changes can also occur in response to other emotional states, leading to a high degree of error. Therefore, polygraphs cannot detect lying with 100% accuracy, nor can they detect emotionality in general. Option B is partially correct in that polygraphs have been shown to be better at detecting positive emotions than negative emotions, but this is not their primary purpose.

Which of the Following Statements About Polygraphs Is Most Accurate