Lie detectors are pseudoscience.
“Whatever the validity of the ‘’control question’’ test, experts on both sides agree there is no evidence that the typical preemployment test is accurate. It usually consists of a long list of vague and general questions, hurriedly administered, concerning personal honesty and habits. The main point, some experts say, is to create a situation that will elicit damaging admissions that might disqualify applicants. The specific results of the polygraph are secondary.”
There’s a reason Polygraph results are inadmissible in court.