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How A Polygraph Machine Is Used 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. Therefore no human being would want to find themselves lying, but when one is subjected to pressure especially if they are on the downside they are probably going to lie. 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. A the difference in rates of breaths which is characterized by a sharp increase in breath rates followed by shallow breaths is experienced. A polygraph quickly detects such changes since It has pneumographic aspect. The the rate of blood pressure also rises sharply in case one is not telling the truth. The polygraph has a cardiographic aspect that quickly detects the change in blood pressure when one is lying. Another important sign that someone is lying is the increase in sweat discharge from their bodies. The galvanograph aspect of the polygraph which uses the principle of electrical conductivity of the skin. The method does not measure the amount of sweat that one produces directly, but it measures electrical conductivity which is bound to increase with the increase of perspiration amount. When the amount increases it ensures there is increase in electrolyte concentration since sweat is ionic liquid allowing electric current to pass through.
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The polygraph records all the data collected during the test in the form of as graph. Initially recording of the information collected by a polygraph was done by tracing it on a chart paper. 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. Computers also allow one to save significant results for different subjects for later analysis or reference purpose.
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A digital polygraph possess other numerous benefits. One of the advantages is that there is software that is specially designed for analyzing information. The the software is also designed to convert the information into the required format for analysis by the examiner. It is advisable that one does not rely on the polygraph as the only test to determine whether the subject is lying.