How A polygraph machine works ?

Billionaire_word on Instagram: "A polygraph test—often called a lie detector—is designed to track physical reactions while a person answers questions. It records changes in things like heart rate, blood pressure, breathing patterns, and skin response. The basic idea is that these bodily signals may shift when someone feels stress or pressure while answering, which some believe can be linked to dishonesty. However, the reliability of polygraph tests is widely debated. These devices do not actuall