Kash Patel Is Polygraphing FBI Staff to Find Out if They’re Being Mean About Him
(www.thedailybeast.com)
While that is true, they have several techniques to make people nervous specifically about their lies.
They ask them baseline questions such as their name to establish general nervousness. They can give the list of questions beforehand so that your expectation of the question you plan to lie about will make you more nervous.
And then there are ways to avoid lies causing nervousness. The best one is that some people can convince themselves that the lie is the truth. Other methods include certain drugs or distracting yourself in certain ways.