First of all, what is a lie detector? It’s also known as a polygraph test. In movies and TV shows, it is used to decide if a suspect is innocent or guilty. But it’s not quite that simple ...

Polygraph tests often aren't admissible in court because they can't actually detect lies, but instead physical indications that often accompany them.

Polygraph tests can supposedly detect when a person is lying. But how can a machine do that, and can we really trust the results they provide?

Lie-detector test results aren’t usually admissible in U.S. courts, but it’s often legal for an officer to use the lie detector as sort of a conversation starter to prod you to confess.

How To Beat A Lie Detector Your heart may be beating fast just at the thought of one, but what are they actually measuring, and is there a way to beat them?

Polygraph tests using comparison questions had incorrect outcomes about 15% of the time The type of test I’m trying to pass however is sounder, and slightly more difficult to cheat.

Williams has long been critical of polygraph tests, criticizing inaccurate and unreliable results. Teaching people how to pass the tests since 1979, he has become the target of the federal ...

They may rely on dubious "science", but lie-detector tests are used to settle relationship disputes and are common in US criminal cases ...