|This article has a real world counterpart outside of Left Behind.|
|This subject has a counterpart in the real world. However, information in this article comes from the fictional universe of the Left Behind franchise.|
A lie detector is a piece of technology that is able to detect when a person is being truthful or lying when answering important questions during an investigation through a person's physiological state.
A lie detector computer program was used to investigate who among the employees working in the New Babylon Global Community palace was the mole secretly passing along important information to the Tribulation Force. Chang Wong, although the mole, managed to pass the lie detector test by focusing on Jesus Christ being his Potentate instead of Nicolae Carpathia during the investigation. Nicolae, who voluntarily submitted himself to the lie detector test, purposely answered falsehoods to all the questions given to him, and yet the computer program recorded them as the truth.