Physiological markers measured on a polygraph (lie detector) indicate changes in stress or anxiety and, therefore, may also indicate lying. People show great differences in their physiological responses measured on polygraphs, and some people beat the machine. Taken together, this evidence suggests that:
A) the polygraph should still be used in criminal investigations despite its problems.
B) using physiological measures to detect lying is basically a good idea.
C) investigators are often right to administer a polygraph test to suspects.
D) the polygraph may not be a good way to accurately detect lying.

Question

Quizplus · Accepted Answer

The fact that people show great differences in their physiological responses to the polygraph and that some people can beat the machine suggest that it may not be a good way to accurately detect lying. Therefore, choice D is the best option. The other options (A, B, and C) are not supported by the evidence presented.

Physiological Markers Measured on a Polygraph (Lie Detector) Indicate Changes