Criminal Law Questions? Ask a Criminal Lawyer.
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You can contact the court and tell them that you want to drop the charges. Sometimes, the court will allow the charges to be dropped before the court hearing, and others require you to appear and announce in open court that you wish to drop the charges previously made (this is the most common way something like this is handled).
If you are the only witness and alleged victim, and you're wanting to dismiss the charges, the prosecutor and judge should accommodate. Also, as a practical matter, if you are unwilling to testify, the prosecutor cannot put on much proof to support the charges if you're not willing to testify.