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Unfortunately, there isn't much you can do at this stage. Right now, all that is going on is an investigation. If you are innocent of the charges, the investigation will show that. I am not aware of any povisions of law that allow someone who is under investigation to sue simply because they are the subject of an investigation. However, if the witness gave false statements to the police or is slandering you to other people, you may have a cause to sue.
Otherwise, your civil rights have not been violated, and you need to wait until the investigation is complete before you take any further action.