A polygraph allows investigators and law enforcement to determine whether the person being interviewed is telling the truth or not. Invented in the 20thcentury, the device works by reading physical reactions. A polygraph test can be used to confirm a specific inquiry or as a general credibility check.
A polygraph test, also known as a lie detector test, is a method of detecting deception through the use of physiological measurements. Polygraph tests are often used by law enforcement agencies, government agencies, and private employers to screen job applicants or to investigate allegations of wrongdoing.
During a polygraph test, the person being tested is connected to a machine that measures several physiological indicators, such as heart rate, blood pressure, and respiration. The person is then asked a series of questions, and the polygraph machine records the physiological responses to each question. The theory behind polygraph testing is that when a person is lying, they will experience a physiological reaction (such as an increase in heart rate or blood pressure) that can be detected by the polygraph machine.
It is important to note that polygraph tests are not foolproof and are not admissible as evidence in all legal proceedings. The accuracy of polygraph tests is a matter of some controversy, and there is ongoing debate about the reliability of these tests.
Electrodes are placed on the person being interrogated, indicating the involuntary physical reactions that indicate whether they are telling the truth. These indicators include increased blood pressure, a faster pulse, and other physical changes, all of which can be detected by the polygraph.
The polygraph is most commonly used by policemen during criminal investigations. Insurance and credit card companies use the polygraph when they sue or they’re being sued. Many private companies and organizations-especially in the fields of money, security, or military-require potential workers to take a polygraph test.
The lie detector tests are usually conducted by authorized personnel from a security company or Intelligence & Investigations company.
The court can order a polygraph test as part of an ongoing investigation or case. In the event that a private company wants the test as part of a pre-employment check, there is no need for a court order/
A polygraph test can be instrumental in uncovering falsehoods or confirming the accuracy of information. Some businesses require their employees to take periodic polygraph tests as a means of preventing illicit behavior
The questions asked during a test vary widely based on the type of information the interviewing entity wants to know.
A polygraph test must occur at an authorized location. A member of law enforcement conducts all police-related tests, but work-related testing or interrogations are performed by an investigation office.