The FBI began reviewing a few hundred cases, but notified only prosecutors of flaws, with the Department of Justice claiming they were not required to inform defendants or their lawyers. In more than half of the 250 cases in which errors were initially identified, prosecutors never contacted defendants to inform them of the potentially exonerating evidence.

Because if the US government locked you away in a hell hole for decades due to their mistake, fuck you, citizen. Stay in hell.

The DOJ since expanded its review to involve thousands of older cases from the 1980s and 1990s.

Oh, for christsake...