Are you familiar with the term “polygraph”? Also known as a lie detector test, polygraphs are instruments used by law enforcement to detect deception or verify truthfulness in a person’s statement. Here is everything you need to know about this valuable legal tool.
What Is a Polygraph?
A polygraph is an instrument that measures physiological changes in a person by recording their physiological functions such as breathing patterns, heart rate, and blood pressure. The purpose of a polygraph is to detect deception or truthfulness when a person is questioned. A polygraph exam is conducted by a trained technician and consists of a series of questions. The results of the exam can either be used to clarify information or to help law enforcement officers make decisions.
How Does a Polygraph Work?
A polygraph works by measuring changes in a person’s respiration, heart rate, and skin conductance. The technicia also may measure changes in a person’s muscle tension. During the test, the technician will ask a series of questions and observe the results to determine whether the person is telling the truth or not. Each answer is recorded on a graph, which is then interpreted by the examiner.
When Is a Polygraph Used?
Polygraphs are commonly used by law enforcement agencies and private firms to investigate criminal activity. They may also be used to help assess the security clearance of job applicants and to verify information provided by witnesses in criminal trials. Additionally, a polygraph may be useful in workplace investigations.
Conclusion
Polygraphs are a valuable legal tool utilized by law enforcement, employers, and other private firms to detect deception or verify truthfulness. They work by taking detailed measurements of a person’s physiological functions and can be an effective way to clarify information and make decisions.