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Use Of Polygraph To Detect Lies Morally, it is wrong to lie to another person a view that is also supported by the biblical teaching and hence the regular conditioning in our minds is, to tell the truth. As much as we ought, to tell the truth always there are times when we are liable of lying especially to avoid the punishment that one should receive if they accepted their wrongdoings. When one decides to lie their bodies are likely to react which is indicated through various measurable physiological changes that are utilized by lie detecting machines as we get nervous and also anxious. A polygraph is the main machine that has been widely used to detect lies since the machine depends on the physiological changes. Though there are different physiological changes that occur in case one lies there are those that are common, and one such change is the increase in breath rate. Immediately after the rise in the breathing rates shallow breathing which is characterized by decrease in depth of the breath occurs. The polygraph can detect such changes through its pneumograph aspect. Also when one is lying there is a sharp increase in their blood pressure. Again this is easily detected by the polygraph since it possesses cardiographic aspect to measure and identify such signs. The amount of sweat coming out through the skin is also bound to increase at the event of one telling a lie. The the electrical resistance of the subject’s skin is measured and any changes noted by the polygraph. The act of detecting a lie from the changes in amount of sweat is not dependent on the machine measuring the amounts of sweat but rather conductivity which increases with increase in amount of sweat since sweat is used as the electrolyte. Increase in the amount of sweat means an increase in concentration of the electrolyte and hence higher conductivity by the skin.
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Results collected by the polygraph are represented in graphical form. In earlier times the polygraphs used to trace the measurements on to a chart paper where after the test the examiner would analyze the results. Polygraphs nowadays can be connected to computers where all the information will be recorded quickly and hence save the examiners time and energy that would have been used to analyze papers. It is also possible through a computer to carry out tests on multiple subjects where the computers store the results for later analysis or reference.
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Using a digital polygraph has several other benefits. The ability to analyze information collected by use of software that has been developed is one key advantage associated with digital polygraph. The software includes capabilities to analyze charts and is specifically designed to help the examiners in their analysis. One may be required to use other methods of detecting lies and not depend on the polygraph only.