In November 2005, a Philadelphia court freed Harold Wilson from death row after over 17 years. He was exonorated on the basis of DNA evidence, but what got him the retrial was heavily documented history of Asst. DA Joe Magill's racist jury selection techniques. Magill also struck African-American jurors at a much higher rate in Harold Wilson's case and the videotape of his training other prosecutors to do this was a evidentiary "slam-dunk" for a Batson challenge.

As you point out so well in the article, the same facts didn't get Mumia a retrial.

Harold Wilson, who now does public speaking events on his case and knows Mumia well from his time on death row, mentions the "Mumia exception" phenomenon when he speaks.