Yes, droves. It seems like about every couple months, there is yet another person railroaded and finally released - sometimes - off death row.
Actually, it's horribly embarrassing and I'm embarrassed for my state. The latest aggregious case is in my own county - Williamson County. Michael Morton was in prison 25 years for murdering his wife. In an act of bad faith, the prosecutor hid evidence (a guy I actually voted for) and then when it came to light that he had not had the bloody bandana dna tested, he dug in his heels and refused to test it until there was a court order. Sure enough, it was comingled blood of the true murderer and the woman, not Michael Morton. Horrific. Just a few months prior there was another man, a black man, I forget his name, was imprisoned for the majority of his life for rape. innocent. The true perp confessed about a decade ago but they refused to run a dna test.
We all have our different perspectives here. My perspective is, I almost always believe LE's hunch. But when it appears to me they are wrongly persuing someone, I'm cautious and aware.
I'm still sick that I voted for that damn DA that was responsible for Michael Morton spending the majority of his life in prison, and I hope the further investigation lands that man in prison.
Google innocence project. It's an education.