Cuz maybe they weren't lying. Polygraph tests are not truly accurate.
I think it's because if you refuse to take a lie detector test, and you can refuse, the cops assume you are guilty. And if you fail it, it isn't admissible in court anyway because too many times it's inaccurate. So there's really nothing to lose by lying.
Because lie detectors are not 100 percent accurate, so they think that they can exploit this idea.
I am so honoured to have this accolade my dear friend, I shall eternally remember this. Thank you, I didn't prepare a speech because.. I didn't think this would happen... Well thanks, and goodnight
because they thought they could be smart and beat it! a lie detecter isnt needed half the time, u can tell by there face