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How To Pass A Lie Detector Test

For most people, lying causes physiological reactions in the body such as increased heart rate, heavy breathing, and sweating. It is the job of a polygraph test to detect these changes, which can let an experienced examiner know when you are trying to be deceptive. Understanding how polygraph machines operate can help you learn how to trick them into believing you are telling the truth, even when you aren’t.

Prior to starting the test, the examiner will establish a baseline of physiological responses by asking a series of relevant and non-relevant control questions. The goal is to determine when you are lying and when you are telling the truth. For example, the examiner may ask if you have ever told a lie. While you may answer no, the examiner assumes the answer is most likely yes. The physiological responses to these control questions are marked to help the examiner determine which answers are deceitful and which ones are truthful.

So a lie is only a lie if it registers as one on the machine by matching the physiological responses to the lie-inducing control questions. The first tip to beating a polygraph test is to blow your lie responses out of proportion on the control questions. Change your heart rate, breathing, and blood pressure when you tell a lie during the control phase so that any lie told during the real examination will skew towards the truth.

One way of skewing your responses is to place a sharp object in your shoe and press down on it whenever you answer a control question. The pain will cause your vital signs to spike and read as a lie on the polygraph machine. This can be fairly effective. However, polygraph examiners have countermeasures to guard against this, such as making the subject remove his or her footwear. An alternative is to bite your tongue, which will produce a similar effect or to think about something scary like spiders.

Remain calm when answering “truthful” questions. Focus on maintaining this calm throughout the entire interview. However, even if your physiological responses change slightly when asked questions you may respond to with a lie, they should skew closer to your “truth” responses if you did the previous step correctly.

Many experts tout the accuracy of polygraph results, but opponents point to the ease in which a person can fool a polygraph examiner as being one of the main reasons they are opposed to them. The test requires such subjective analysis of responses that could be easily manipulated, which renders it not as useful as proponents would have the public believe.