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The truth about lie detection

Lie detection, also known as deception detection, uses interrogative techniques accompanied by technology that records physiological functions to determine truth and falsehood in a particular response. It is frequently used by law enforcement and has in the past been seen as an inexact science. There is a wide variety of technologies existing for this purpose. The most common and oldest measure is the polygraph, which the American agency, the National Academy of Sciences affirm that in populations unskilled in countermeasures, can distinguish lying from the truth to an extent above chance, yet below perfection.

The amassed research data indicates that machines can, in fact, detect deception, but with substantial amounts of errors, and those tactics can be used to evade polygraph tests, so-called “countermeasures”, might be effective. Despite having a few flaws, results are admissible in the courts of some countries such as Japan. Lie detector results are hardly ever admitted as evidence in most courts around the world.

Lie detection normally involves the polygraph; however, it is not believed to be reliable by some. It detects autonomic reactions and these changes in body functions are generally not easily controlled by the mind and include bodily reactions like heart rate and skin conductivity. The devices can also consider blood pressure, capillary dilation, respiration rate, and muscular movement. When taking a polygraph test, the subject wears a blood pressure machine to measure blood pressure variations. Respiration is then measured by wearing pneumographs, which fits across the chest, and electrodes are wrapped around the subject’s fingers in order to measure skin conductivity.

In order to determine what the truth is, it is assumed that the subject will show more evident signs of fear with regards to answering the control questions in comparison to the relevant questions. If a person is indeed being deceptive, there will be fluctuations in the autonomic stimulation responses to the relevant questions. Outcomes are considered questionable if there is a lack of fluctuation when responding to any of the questions. These results are meant to point out a short-term stress reaction which can be from lying or implication to the subject. This becomes problematic because they are also linked to mental effort and a person’s emotional state, so they can easily be influenced by fear, anger, and surprise for example. There are many instances where many people have found methods to try and cheat the system. There have been some people have been known to take sedatives to decrease anxiety; using antiperspirant to avert sweating, and biting parts of the mouth after answering each question to exhibit a constant physiological result.

Life Crusader Polygraph Services offers polygraphy testing services for both the corporate and private sector. Life Crusader Polygraph Services uses the notorious AVSAPRO fully automated voice polygraph technology. This modern version of lie detection testing is a more accurate method of detecting deception. Knowing that you are employing a genuine and honest employee can be highly advantageous to employers. LCPS offers pre-employment background checks to this effect. A company can choose to do a pre-employment polygraph test to check for general truthfulness and integrity of the candidate they intend to employ, or otherwise, they can take the complete package which includes a background check of criminal history by means of AFIS (Automated Fingerprint Identification System), checking of credit history and qualifications verification.

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