Can you really prove if someone is lying by hooking them up to a machine and running some tests? Apparently so if you use a polygraph, otherwise known as a lie detector. It works by measuring changes in the body such as blood pressure, pulse, respiration, and skin conductivity when a person is asked a series of questions. How reliable is a lie detector and are the results ever wrong? | The Infographics Show

4.2K views · 19 reactions | Here's how you beat a lie detector test | Bloomberg Television | Facebook