Polygraph Expert Shows How to Beat a Lie Detector Test



Doug Williams is a former Oklahoma City detective sergeant. As an officer in the department’s internal affairs and polygraph unit, he conducted thousands of polygraph tests. In the late 1970s, however, Williams began to doubt that the so-called lie detector actually is such a thing, and within a decade he had evolved into one of the most vocal, visible, and theatrical critics of the polygraph. Williams shows Bloomberg exactly how simple it is to manipulate, and beat, the lie detector test. (Video by Jennafer Savino and Justin Beach) (Source: Bloomberg)

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23 thoughts on “Polygraph Expert Shows How to Beat a Lie Detector Test”

  1. I think this guy is full of sh*t. He claims to believe that polygraphs are inaccurate. Well first of all,when he was an examiner in the early 70s, the machines would not have been as accurate as they are now. And 2,they are also trying to imprison him for counts of mail fraud,which is obviously nothing to do with teaching people to cheat the polygraph,and he plead guilty. I think hes a criminal

  2. The government is just mad because you’re taking away one of its interrogation techniques that works very well or are you least used to until people realize it didn’t work. It’s like a placebo. And if people know they are just taking a placebo it’s not going to affect them because they already know. I don’t think anyone should ever get convicted based on a polygraph test which is why they can’t be used in court but if it is used to extract evidence from someone who is guilty because they think they will get caught lying I don’t see anything wrong with that. There’s a lot of corrupt things at the police do but using a lie to scare someone into telling the truth doesn’t really bother me as long as they are getting the truth

  3. The fact that they are trying to send this guy to jail and find him for putting it out there is ridiculous. I see that they wouldn’t want it out there is public knowledge because then they can’t use it but to ruin this guys life for putting the truth out there is a crazy AND hypocritical

  4. Why would someone post this for all the rapists and child molesters to see! I hope it don’t work….

  5. They want to put him in prison because if people know this then the cops can’t use these tests to intimidate suspects into giving a confession. So therefore the police departments mad that this guy is destroying there scarecrow for suspects.

  6. Yes if they worked then y not fire all judges prosecutors and lawyers and just use polygraph test ol that's right they no polygraph test are a joke

  7. Am I the only one that thinks his explanation (and then the immediate following video clip) is reversed, when he is showing the examples of the “controlled” & “relevant” questions.

    When he describes what a “controlled” question is (then the immediate following club is of a “relevant” question. (& vice versa)

    For example; at 3:38
    “is your first name Jenna?”
    is a “control” question, not a “relevant” question.

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