In polygraph tests for screening job applicants,the real lie detector is the device and not the operator.

Question

Quizplus · Accepted Answer

While the polygraph device collects physiological data such as heart rate, blood pressure, and respiration, interpretation of those data is subjective and depends on the skill of the operator. There is no definitive way to determine if someone is lying solely based on the physiological data collected by the machine. Furthermore, some people can manipulate their physiological responses to appear truthful even when they are lying, further complicating the accuracy of the test.

In Polygraph Tests for Screening Job Applicants,the Real Lie Detector