Lie detector test, also known as polygraph testing, has become so popular not only in real life but also in comedies, advertisements, and crime dramas. Basically, the lie detector does not sense lies but the signs of emotions. The wires of the polygraphs are connected with the body of suspect and measure the changes in blood pressure, respiration, and sweating. Before a suspect a tested, the operators of the polygraph convince the suspect by giving the experience of stimulation test to catch the liar. Some operators don’t trust that polygraph records truly detect lies.
The operators use some strategies on suspects to know the truth. If the suspect is innocent, he will think that the detector is making no mistake and will believe, whereas if the suspect is guilty, he will be terrified of being caught. The suspect and polygraph operator depends on the record, which the test shows. You can get the Lie Detector Test UK prices and buy the detector machine at a reasonable price.
The reason for polygraph falling short
The suspect always believes in the lie detector and thinks it has the ability to catch the truth. If the suspect is truth-teller, then the signs of fear will be uncertain. Sometimes the polygraph test fails as the innocents have a fear of being falsely accused, and criminals don’t consider machines as useless and think to beat it. People who think they can get away with the machine are really able to do it. Polygraph operators tend to convince the suspect to extract a confession by telling them they can’t beat the lie detector test. If a suspect doesn’t get confessed or convinced, operators cudgel the suspect. The main aim is to make the guilty confess about the things or crime by mounting detection apprehension.
Alternate of Polygraph procedure
The alternative method for this procedure is the Guilty Knowledge Test (GKT). It involves developing a multiple-choice options test that includes items linked to the knowledge that a guilty subject must-have. The questions would be less tricky than the polygraph test, and id the guilty suspect knows the right answer, a huge physiological reaction will designate deception. A psychometrically sound estimation can be developed with some number of items. One specific limitation of this alternative is that it can only be used when investigators have accurate information about the subject of guilt.
Accuracy of Lie detector test
This test has always been in controversy as there is no proof that the outline of physiological responses is unique to dishonesty. Dishonest persons have confidence that the machine can’t find their mistake while honest people always worry about being truthful and getting caught. Studies show that it is impossible to get to a conclusion and get an appropriate validity study. Still, people use the polygraph test in many different situations to find out whether the suspect is truthful or not. Also, people who use strategies to clear or pass out the polygraph test are proved to be helpful and effective.