Polygraph - Wikipedia
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 …
Do “lie detectors” work? What psychological science says about …
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 …
Understanding Polygraph Testing: How Lie Detectors Work
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 …
Are Lie Detector Tests Reliable? Here’s What Science Says
Nov 26, 2025 · A lie detector test, also known as a polygraph, is a device and procedure that can (allegedly) detect when someone’s lying while answering questions by picking up on a variety …
How Do Polygraphs Work? - Psychology Today
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 …
Polygraph Frequently Asked Questions
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 …
The FBI and other federal agencies are using polygraph tests to …
Apr 30, 2025 · Federal agencies have stepped up their efforts over the past few weeks to find potential leakers, and some — like the FBI, the Department of Homeland Security and the …
Polygraph analysis | Research Starters - EBSCO
Polygraph analysis, commonly referred to as lie detection, is an interrogation technique that measures physiological responses—such as heart rate, blood pressure, and sweating—to …
How Does a Lie Detector (Polygraph) Work? - HowStuffWorks
When a person takes a polygraph test, four to six sensors are attached to him. A polygraph is a machine in which the multiple ("poly") signals from the sensors are recorded on a single strip …
18 Pros And Cons Of Polygraph Examinations In The Investigative …
Sep 13, 2024 · A polygraph can help narrow down suspects, eliminate certain individuals from suspicion, or provide leads that investigators can pursue. The test can be one piece of the …
What Are Polygraph Tests and How Do They Work? - LegalClarity
Aug 10, 2025 · Polygraph tests, often called “lie detector tests,” measure and record physiological indicators while an individual answers questions. They aim to assess the truthfulness of a …