What is a polygraph examiner?

A polygraph examiner is a trained professional who uses polygraph instruments, commonly known as lie detectors, to assess whether individuals are being truthful or deceptive during interviews. They measure physiological responses such as heart rate, blood pressure, respiration, and skin conductivity while asking a series of questions. Polygraph examiners typically work for law enforcement agencies, private firms, or government organizations, and they must adhere to strict ethical guidelines. Their findings are used as investigative tools, though polygraph results are not always admissible in court.