The Invention of the Lie Detector

The lie detector, a controversial tool used by investigators, has a dark and complex history. It originated from the work of psychologist John Larson, who developed a machine to track changes in blood pressure and pulse, believing that these physiological responses could indicate if someone was lying. Larson's invention was used in high-profile cases, such as the murder of Anna Wilkins, where the lie detector tests were pivotal in the investigation. However, the lie detector's reliability and scientific validity have been highly debated, with critics pointing out its subjectivity and potential for false results. The machine has faced legal scrutiny, notably with the Frye standard, which requires broad acceptance by experts before being admissible in court. Despite its flaws, the lie detector continues to be used in investigations, highlighting the importance of understanding its limitations and the potential consequences of relying on it as a sole source of evidence.