The biggest plot hole *SPOILERS
1) Jeopardy is still attached to his case. He was found guilty and the verdict was set aside due to prosecutorial misconduct. They don't get another chance.
2) But lets say that they did. What evidence do they have? The fact that the dead woman had the same tatoos on her fingers that an anonymous interviewee had that he interviewed years earlier? And this "evidence" was found by a person who works for the DA. The same DA that was just arrested for fabricating evidence?
3) She also finds that an evidence picture was altered so that immediately leads to the arrest of Michael Douglas. Why? Couldn't he blame it on an underling in his office? What would they have that points to the DA himself?
4) The whole scheme seemed far fetched to begin with. Why if he really did leave some of his blood at the scene or the witness could identify him? Everything would have had to work out perfectly to even start the process.