>In 2015, the Justice Department and the FBI formally acknowledged that nearly every examiner in an FBI forensic squad overstated forensic hair matches for two decades before the year 2000. Of the 28 forensic examiners testifying to hair matches in a total of 268 trials reviewed, 26 overstated the evidence of forensic hair matches and 95% of the overstatements favored the prosecution. Defendants were sentenced to death in 32 of those 268 cases.
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>The executions of Nathaniel Woods, Dustin Higgs, and Troy Davis have been cited by some as possible cases of wrongful executions.

https://en.wikipedia.org/wiki/Wrongful_execution