Polygraph examinations, also known as lie detector tests, have been used for a long time to find out if someone is telling the truth in criminal investigations, job interviews, and personal matters. The way lie detector tests are shown in the media is often dramatic, but the real process is based on science, psychology, and trained interpretation. This guide will talk about how lie detector tests work, what they measure, how the tests are done, how accurate they are, and how modern alternatives like EyeDetect stack up.