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Generally, once the charges are filed by the state prosecutor, it is not up to the victim whether the charges are prosecuted, but up to the prosecutor and the judge and unfortunate the witness / victim would generally be subpoenaed to testify at trial and if the victim doesn't comply with the subpoena and doesn't appear in court to testify, then the victim could face contempt of court and could face penalties which can range from fines to jail term, until the victim complies.
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