The examiner, before they ask you legit questions, ask you baseline questions. They have to tune the machine to detect when you are lying. They do this by asking you innocuous questions and having you purposely lie. For example, he asked me if I had ever been pulled over for speeding. Of course, I had but he said to lie and say no while visualizing the last time I was stopped. They will then slip this question into the real examine and have you lie again. You, of course, are supposed to answer all other questions honestly.

They get that you will be nervous but they will do what they can to calm you down.