Lying is usually a defense mechanism that we use to get ourselves off the hook. Sometimes we can tell when a person is lying, but other times it may not be so easy. This episode will reveal why a “lie detector” doesn’t really detect lies. You will discover what happened when actor Kirk Cameron tried to fool a polygraph machine. Why did his heart rate and blood pressure suddenly increase when he answered certain questions? This episode will also show you that there have been two reliable witnesses to every crime of this world. Do you know what they are?