The Preliminary Credibility Assessment Screening System, or PCASS, captures less physiological information than a polygraph, and uses an algorithm, not the judgment of a polygraph examiner, to …

What is a polygraph? The term "polygraph" literally means "many writings." The name refers to the manner in which selected physiological activities are simultaneously recorded. Polygraph examiners …

Aug 5, 2004 · During a polygraph test, an interviewer or interrogator asks the subject a series of questions designed to elicit truthful answers and lies, then measures physiological changes in …

Mar 26, 2025 · The polygraph is a tool commonly used in law enforcement to test whether defendants, witnesses, and other individuals who are party to a criminal case are being truthful or deceptive. It’s …

Jun 29, 2022 · When people lie, their bodies tend to react in detectable ways. Polygraphs measure physiological changes in the cardiovascular system, breathing, and sweating. By comparing the …

Jan 25, 2026 · Polygraph tests, commonly known as lie detector tests, track and record physical signs while a person answers specific questions. These tests aim to measure the body’s involuntary …

A polygraph test works by measuring someone’s physiological responses, which are believed to change when a person is lying. The polygraph, often referred to as a lie detector, is an instrument that …

What is a polygraph? A polygraph, most commonly referred to as a lie detector, is a machine that is used by law enforcement to test the physiological responses of individuals to certain questions.

A polygraph examiner watches for fight-or-flight responses as you answer specific questions. This piece explains the science behind polygraph technology and shows what physical signals these machines …

The term “polygraph” means “many writings,” referring to how it records multiple physiological responses simultaneously. Polygraph examiners use either conventional analog instruments or computerized …