AS to 'Lie detector' tests, don't bother with them. They are not legal in almost any court due to their being highly innacuarte. You might as well just flip a coin. Sure, the promoters of these 'services' will proffer supposedly honest studies of how accurate and truthful their 'detectors' are, but in the end, the test is a matter of interpretation, and guestimates are NOT fact. The machine only detects changes in one's body, but what do those changes really mean? Remember, it is in the interests of those selling such tests to promote them since they make a profit from them, so whether or not truth is revealed is really immaterial to them; they just want the money, since they are not the ones to lose a job or go to jail. These charlatans prey upon the fears of honest businessmen looking for any way to keep themselves from being ripped-off by employees, who therefore grasp blindly at any hope of finding truth. Such desperation leads to tragedies for both sides, but only profit for those administering these morally and legally bankrupt tests.
In the Bible, God commanded that in a matter of law breaking, it was at the testimony of "two" [or more] that a matter was established, which demonstrated His higher standard of justice than man's. Who is so naive as to imagine that man can establish a higher standard?