How many people in prison who are like this guy, but don't have the evidence to prove it?
A man who spent 28 years behind bars for a rape and murder he said he did not commit walked out of a federal prison in Arizona after DNA testing showed he was innocent. The conviction of the man, Donald E. Gates, 58, was based largely on the testimony of an F.B.I. forensic analyst whose work later came under fire and a hair analysis technique that has been discredited. The same judge who had presided over Mr. Gates’s trial in District of Columbia Superior Court ordered his release.