Polygraph have been around for over a century. More commonly known as lie detector tests, these devices have revolutionized the criminal justice system by enabling investigators to shrink their pool of suspects. Lie detector tests were first used in criminal investigations during the Frye v. United States case of 1923. Although the test results were rejected due to inadequate scientific proof, the trial generated significant interest in the potential role of polygraphs in legal proceedings.   In 1934, a polygraph machine co-invented by Leonarde Keeler, known as the Keeler polygraph, was used on two Wisconsin murder suspects. Not only were the results admissible this time around. However, they also impacted the outcome of the case, leading to the defendants’ conviction.   Polygraph exams became increasingly popular throughout the ‘60s and ‘70s. However, their