If Ms belich is a defense witness, then perhaps she wouldn't be allowed in the courtroom until she testifies. If she were last on the defense's list of witnesses called or was cancelled at the end of the defense case, it would be very difficult for her to report on Mr Baez's daily antics. Perhaps the defense doesen't want Kathi B sitting in court watching them work?
It appears from the SA's motion, they want to hear the good reasons for adding witnesses past the deadline.
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