In 1902 Sir James Mackenzie invented the Lie Detector also called the polygraph. His invention was a less successful machine then the Polygraph that John Larsen invented. The Polygraph is used in police interrogation but only if it needs to be used.
1855- Mackenzie was caught stealing 1,000 sheep from a sheep station north of Timaru.
1897, to measure the resistance of the skin to small electric currents emitted through metal electrodes attached to two fingertips of the subject.
1902- Sir James Mackenzie invented the Polygraph
1915- an American psychologist, William M. Marston, began to demonstrate a lie detection test
1930- just before World War II, the government and private businesses took over further advances in the technology related to the polygraph.
1931- Mr. Leonardo Keeler patented his device before proceeding to market his device to police departments across the country.
1938 using the lie detector to determine the positive reaction to using this razor.