accuracy of polygraph testing

Polygraph testing, often called a lie detector, measures physiological responses like heart rate, blood pressure, and sweating while a person answers questions. These responses can change when someone is deceptive, but they can also be affected by stress, anxiety, or nervousness regardless of truthfulness. Because of this, the accuracy of polygraph tests is limited, and they are not foolproof indicators of deception. They are typically used as tools to assist investigations rather than definitive proof of lying, with results interpreted alongside other evidence and context.