Welcome to the Polygraph History category on LieDetectorTest.com! This section is dedicated to exploring the fascinating origins and evolution of the polygraph, commonly known as the lie detector. Gain a deeper understanding of the scientific principles, inventors, and milestones that have shaped the development of this remarkable tool over the years.

As you delve into the rich history of the polygraph, you’ll learn about its early beginnings, the various technological advancements, and the controversies that have surrounded its use. This category will provide valuable insights into the role of the polygraph in criminal investigations, national security, and other areas where truth verification is essential.

Join us on this captivating journey through time, as we unravel the story behind the polygraph and appreciate its impact on our modern world.

Polygraph HistoryPolygraph Examiner

John Larson – The Innovator of Polygraph Science

John A. Larson, a true innovator, developed the world's first accurate lie detector device, laying the foundation for the modern polygraph machine. Larson's interest in deception detection began with the work of William Moulton Marston, where he measured changes in blood pressure, pulse rate, respiration, and electrical skin conductivity. Larson advanced Marston's work, modifying an Erlanger Sphygmomanometer to record changes in blood pressure using a smoked paper drum and a kymograph. Larson published several papers on his instrument, which served as the foundation for Leonard Keeler's advancements in the 1920s and 1930s, earning Larson a spot in history as one of the biggest contributors to the improvement of criminology and criminal interrogation techniques.