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In prehistoric times they would press their hand into clay to make a fingerprint, this could act as a form of identification in Babylon. http://www.ancientpages.com/2016/03/04/fascinating-ancient-history-of-fingerprints/
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A Greek physician learned that someones pulse would increase when they lied. https://www.medicalnewstoday.com/articles/258118.php
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A Roman attorney was able to prove that bloody palm prints left at the scene had been used to frame a blind man for murdering his mother. http://paintingandframe.com/prints/others_roman_court-37257.html
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The book "Hsi Duan Yu", was the first documentation of the details to tell the difference between drowning and strangulation. https://wikivisually.com/wiki/Collected_Cases_of_Injustice_Rectified
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Investigators at Scotland Yard began to do bullet tests to compare bullets to match with a weapon. https://sustainablepulse.com/2018/01/08/shocking-study-shows-glyphosate-herbicides-contain-toxic-levels-of-arsenic/#.W3eF6OgzouU
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Researchers developed tissue tests that could identify arsenic. https://sustainablepulse.com/2018/01/08/shocking-study-shows-glyphosate-herbicides-contain-toxic-levels-of-arsenic/#.W3eF6OgzouU
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Instigators began using body temperature to see the time of death. Fingerprint identification became more systematic during this as well. https://www.forensicmag.com/article/2012/09/science-behind-gsr-separating-fact-fiction
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The first portable polygraph machine, otherwise known as a lie detector was invented. https://people.howstuffworks.com/lie-detector.htm
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Gunshot residue is a residue that will get on anyone who has fired a gun. Researchers created a test to detect the residue on the person or their clothing. https://www.forensicmag.com/article/2012/09/science-behind-gsr-separating-fact-fiction
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Modern CSI brings DNA analysis, insect forensics, enhanced biological studies, and technology such as cameras and computers have brought a lot to the table. https://authorjenniferchase.com/2017/08/08/modern-forensics-solves-the-murder-3-recently-cracked-cold-cases/
