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Forensic scientists started using body temperature to determine a person's time of death. This practice began in the early 1800's.
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In Chinese culture they would use their fingerprints to mark important documents and sculpture. It was the first time fingerprints were documented to be used as identification.
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The first case of a forensic firearm examination happened in 1835, when Henry Goddard applied what he knew about ballistic fingerprinting to link a bullet to an actual culprit.
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Johann Friedrich Miescher, a swiss chemist, discovered the molecule known as DNA in the 1860s.
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Karl Landsteiner, an Australian doctor who discovered that there are different blood groups, which made making blood transfusions safe.
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Jeffrey Glassberg first discovered that you could use DNA as a material for identification of an individual.