Most Innocent Project releases are made on new DNA evidence because of the huge strides made in that area.
New DNA evidence usually causes a readonable doubt.
There was a case about 15 years ago where the Innocent Project people said they had found DNA evidence from the truck where a murder took place that would prove their hero not guilty because he said he wasn't even in the truck. They gloated how they were going to make the small-town Florida po-lice look like racist hick fools. When the DNA results came in, it was an exact match for their hero and so he remained in prison.