Sonotrade on Instagram: "A lie detector test (usually called a polygraph) measures bodily responses like heart rate, blood pressure, breathing, and skin sweat while a person answers questions, because the idea is that stress or anxiety can show when someone might be lying. However, polygraphs don’t directly detect lies — they only record those physical reactions, and things like nervousness, fear, or confusion can look the same as lying on the machine. That’s why scientists and courts often cons