Lie detector tests have been useful in legal matters and court meetings or hearing. It’s been widely used as a reliable evidence for anything that deals with legal matters. It is a way of discerning whether a person is telling the truth or not in a certain subject or case. Lie detection tests come in various forms ranging from voice stress analysis, polygraph tests, and cognitive chronology. Each lie detection tests use and psycho-physiology and scientific method. Polygraph is accepted in court for some states in the US. There are companies who offer lie detection test in Los Angeles and polygraph test in Los Angeles.
It was created to emphasize the physical side effects of lying. In West Africa, the tribes would form some groups passing an egg between each other and whoever break the egg will be the liar because being nervous is associated with guilt. In 19th century, the law officials use the lie detector in measuring the blood pressure of the suspected criminals. The father of polygraph is William Marston and he published The Lie Detector Test in 1938. The book is supporting its usage among America’s judicial system. Analog is being used for the first polygraphs. Now, it is computerized for accuracy rate.
The principle of lie detector test is to bring out the truth by means of the brain and body reflexes. One of the most popular lie detector tests is the polygraph exam. Polygraph examiner in Los Angeles and other areas record and the measures the physiological responses of the person such as respiration, pulse, skin conductivity, and blood pressure. The major changes on
the sympathetic nervous system of the person are being highlighted whenever there are provocative questions.
The government of US have been keen on using polygraph test or psycho-physiological detection of deception for cross-examining the suspected spies and criminals. One of the widely used psycho-physiological detection tests is the VSA or voice stress analysis. It monitors any hint of stress response on the person’s voice that may result from lying. It can also use in catching a lover who is cheating. The government also prohibits the use of polygraph among private employers before and during the employment but the government employees can undergo the test.
The success of lie detection test is based on the person’s psychological mindset. If the person believes in the effectiveness of this test, he is more vulnerable. The interrogators can influence the person into believing the effectiveness of the lie detectors. There are companies which offer accurate lie detection in CA. The said examination received some criticisms because it uses intimidation to invoke nervous responses from the person.
The common misconception is that it is not 100% accurate and it only produces 90 to 95% accuracy according to law officials. It also leads to the convictions of innocent people occasionally. It had a little success on exposing spies like Karl Koecher and Ann Belen Montes.
Lie detector tests should only be in used in discerning criminal cases but not on innocent people.
For more information, please click these links: lie examiner in CA, lie examiner in Los Angeles, and Los Angeles polygraph. Or visit http://www.polygraphinvestigation.com/