The DA has the authority to move to dismiss any case he or she chooses to move to dismiss.
So, the real question is whether the prosecutor will decide to make a motion to dismiss in the case you are talking about in your question.
Without knowing more about the case and who the prosecutor is, any answer I could give to that would only be a blind guess.
You really need to make sure that your fiance's attorney knows what you have said in your question.
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So you are the victim and you want to see if you can get the charges dropped? It's completely up to the DA. I would talk to the defense attorney about the best way to proceed.
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