Although my first reaction is to support the idea of being able to retry cases when new evidence emerges, I can see the pitfalls if this were applied in a real-world justice system. There would have to be some pretty big barriers to overcome to prevent abuse (on the usual suspects, the poor and/or people the police/politicians just don't like) and then more rules to make sure those barriers themselves aren't used as loopholes by the truly guilty. I think it could be done, but its just as likely they do it in such a way to maximize state power without checks or balances.