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Galton published the first book on fingerprints and there use in solving a crime .
Henry used galtons work to develop the henry classification system of  grouping people based on their fingerprints.

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He descovered blood typing groups ( a,b,c - which was changed to o).

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He established the federal bureau of investigation ( FBI).                            1935 the bureau ranamed to FBI originally it was called the federal bureau of investigation .

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He figured out how to test dried bloodstains at a crime scene to figure out what blood group it belonged to. The test for ABO groups is formally called the lattes .

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calvin developed the comparison microscope to help determine if a gun had been fired a specific way

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AFIS ( automated fingerprint identification system ) SAFIS ( state automated fingerprint identification system)

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William establishes the body farm outside knoxville , TN .                          Here the corps was subjected to various conditions to help investigatiors learn more about the crime .

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Its a way of determining ones DNA characteristics .