The increase in the rate of crime these days is higher and getting worse than ever with each passing day. Proving every crime and the criminal guilty is much harder than it could be assumed. Most of the crimes remain as piled up files owing to lack of evidence, with the passing of time get covered with dust, eager to see the light. Back in 1921, a young medical student and a police officer, both hailing from Berkeley invented a machine that was capable of detecting human lies through physiological means by measuring heartbeat, pulse, perspiration thus opening the doors to a new method of investigation, this method was called lie detector test or polygraph.
The need for polygraph
It doesn’t always have to be a homicide, but any kind of act that threatens the national security is a crime. And considering the repercussion and intensity of the crime, the judiciary in many countries gives permission for a polygraph as a last resort to elucidate the matter. When a person (say suspect) is subjected to polygraph, a telltale sign is that the suspect tends to sweat or the blood pressure of the same goes up while answering few question, these are typical signs that indicate that the suspect is probably lying. However, apart from investigating the criminal aspect, the use of polygraph is increasing in terms of checking the employee authenticity in many reputed organizations. This type of employee screening not only helps recruiting the best candidate and enables you to know whether the employee is honest and ethical. Again, such practice is prohibited due to certain controversies surrounding it and the result again is not always a hundred percent accurate. A lie detector test doesn’t prove that the person is guilty because it is mainly focuses on the physiological behavior of the person and there are chances of an honest one because of nervousness end up succumbing to the situation.
So using this technique for interrogation or to analyze the reaction of the subject on the basis of few questions arises a scoop for a good debate. The examiners here use their own ways such as for police investigations they often prefer the computerized techniques and on the other side for employee screening individual scoring methods are used. In an organization, however, terminating an employee on the basis of the polygraph is against the law and the employee is subjected to the test only if the overall investigation involves financial loss or any issues that might hamper the reputation of the company. Apart from the fact that polygraph is still a question of right or wrong, but there are many instances where this test had proved to be a great tool for investigation when nothing else seemed to workout.