I also wonder if she thought that the audio stuff was so flaky that if the prosecution brought in their audio experts that the defense witnesses might destroy them through the defense witnesses testimony. It need not be oppositional (prosecution says it is the Right Reverend St Trayvon versus defense saying it is George Z. It may simply be that the prosecution says it is His Holiness St Trayvon versus defense saying "We cannot tell who it is - there is not enough there to tell with any certainty.) This second scenario might be more dangerous as the jury could decide the defense is right and the audio stuff goes out the window.
That’s an interesting analysis. Let’s “pretend” the Judge is actually an official member of the Prosecution (as opposed to the defacto member she is now).
She’s just been shown in no uncertain terms what the Defense intends to do if she calls her expert witnesses: Impeach them so thoroughly they’ll actually discredit the science of audiology. Worse, it’ll happen in front of the Jury. The damage to her case could be so severe her side could never recover, and real incriminating evidence will be brought into question as it’s being presented. Prosecutor Nelson has concluded she’d be a fool to put Owens and Reich on the stand and accept their findings.
/hypothetical