A Paragraph (or more) about a Polygraph
You may have heard of a device called polygraph a.k.a. lie detector. How does it work?
When a person tells a lie, he is (normally) very uncomfortable about it, and his heart may beat faster, his blood pressure may go up, or he may begin to sweat. If the polygraph picks up these changes, that can be used as proof that the person is not telling the truth.
The FBI, CIA, and many police departments use polygraph tests to see if people are being honest. Yet, others argue that the lie detector is not reliable, and some smart crooks can even “teach” their bodies to lie to the lie detectors.
Here is some “food for thought”:
Would a polygraph test be valid evidence in a Beis-Din, a court of Jewish law?