DNA evidence has freed hundreds of prisoners wrongly convicted of crimes.
Harder to prove are cases where inmates say they're innocent, but there's not genetic evidence to substantiate their claims.
That's one problem facing Darrell 'Diamond' Jones, a man convicted of first degree murder in Brockton.
"Darrell was convicted 30 years ago and in the eyes of the court, in the eyes of the prosecutor, probably in the eyes of many members of the public, he's guilty. So to say it's an uphill battle is an understatement," said Lisa Kavanaugh, director of the Innocence Program, a unit of the Massachusetts public defender agency.
This week WBUR, in collaboration with the New England Center for Investigative Reporting, is examining the case of Darrell Jones in a series of stories called "Reasonable Doubts: Reopening The Case Of Darrell ‘Diamond’ Jones.” Listen to Part 3 above, or you can read the digital version of our joint investigation here.
Editor's Note: At 2 p.m. today, our site will host a live chat with WBUR's Bruce Gellerman, his colleagues from NECIR and several legal experts. They'll be answering your questions about Darrell Jones' cases and this investigation.
This segment aired on January 13, 2016.