Which statement best describes polygraphs?
◦ Polygraphs can detect lying with almost 100 percent accuracy.
◦ Polygraphs can detect positive emotional states with a high degree of accuracy and negative emotional states with a low degree of accuracy.
◦ Polygraphs can detect emotionality that accompanies lying some of the time, but with a high error rate.
◦ Polygraphs cannot detect emotionality at all.