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A 2009 paper by the US National Academy of Sciences found that among forensic methods only DNA can reliably and consistency match evidence to specific individuals or sources. While it's commonly understood that techniques such as analysis of blood spatter patterns are up for debate, other types of visual evidence have been more readily accepted. In 2015 the FBI announced that virtually all of its hair analysis testing was scientifically indefensible, and in 2016 the Texas Forensic Science…