Since the late 1980s, DNA analysis has helped identify the guilty and exonerate the innocent nationwide. While DNA testing was developed through extensive scientific research at top academic centers, many other forensic techniques — such as hair microscopy, bite mark comparisons, firearm tool mark analysis and shoe print comparisons — have never been subjected to rigorous scientific evaluation. Meanwhile, forensics techniques that have been properly validated — such as serology, commonly known as blood typing — are sometimes improperly conducted or inaccurately conveyed in trial testimony. In some cases, forensic analysts have fabricated results or engaged in other misconduct.
More Information can be found on the Innocence Project's website.