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in 1921, the first polygraph test was invented by John Larson.
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In 1248, China wrote the first book about forensics called, "Ming Yuen Shih Lu". The belief of forensics was based on the first mention of this concept which was the Chinese written book.
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Pathology deals with the causes and effects of diseases, especially the branch of medicine that deals with the laboratory examination of samples of body tissue or diagnostic or forensic purposes.
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In 1784 the first recorded instance of physical matching evidence leading to a murder. The evidence used was a torn edge of newspaper in a pistol that matched the newspaper found in his pocket.
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In 1854, the first city in the United states to use photography for criminal identification was San Francisco
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In 1910, Victor Balthazard and Marcelle Lambert publish the first study of hair, including animal hair.