I can't imagine how a person could get a fair trial which includes false evidence supplied by a state run lab. It would be impossible to sort out what evidence the jury believed and which they didn't, raising the possibility in EVERY case that the state lab results were relied upon in reaching a verdict. Upon what basis would an appeals court deny a re-trial?
Don’t deny a re-trial, but don’t release the assumed perp! Wait until it can be shown that a re-test of stored evidence cannot prove guilt. By all means have a re-trial.