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automatically. If everyone-- cops, DA, victim... agrees, sometimes a judge can overturn a conviction, but that depends on local law and an experienced local criminal attorney would know more about how it works. In this case, even though they might have found someone else's DNA, the prosecution could argue that she had consensual sex (which she may have forgotten about!) and he used a condom. Such things, and crazier, have been argued successfully.
One thing we have to understand when reading about these cases is that everyone involved-- cops, victims, families, lawyers on all sides-- have a tremendous amount of personal emotional involvement in them, and after years of investigation and trials, they have a hard time accepting that what they thought was a closed issue was now a gaping open wound again. None of us likes to admit we were wrong, and the stress of the crime and the trial just adds to the angst.
Usually, you go the appeals route and a new trial is ordered. In Texas, that may mean the Court of Criminal Appeals is the last resort unless something can be done in Federal court. And, the Texas Court of Criminal Appeals is not known to be particularly friendly toward anyone convicted.
Now, this gets tricky, and although I'm not a lawyer myself, I've had enough discussions with criminal lawyers to know that a jury conviction is considered pretty much immutable-- the jury is presumed to have heard everything and arrived at a proper judgment. New evidence is not automatically a reason for a new trial, and never a reason for an appeal. Appeals are based not on jury error or misunderstanding, but on some legal or procedural error made during trial. Lawyers twist every which way to figure out how to strategically word an appeal to get it to work, since the system is designed to help it fail.
If all this isn't depressing enough, there was a death penalty case 20 years or so ago where (DAMN! I can't remember the name) where our BFF Scalia wrote for the majority that an appeal was filed a day late, so it was null and void even though new evidence proving innocence was found-- possible innocence is no reason to cancel an execution if the paperwork isn't in on time.
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