You have to testify truthfully. They will probably have some documentation which they can show you to refresh your memory. The court will then have to determine, based on the testimony regarding the event generally and your testimony if it is credible that you could have forgotten everything, or if the court thinks that you are simply saying that because you don't want to be involved in the case. What happens in the case overall depends on what other testimony besides yours exists. If you have any sort of documentation of a medical problem or injuries that caused memory impairment, you may want to consider providing those to the state attorney, but you may also want to consider retaining your own attorney and discussing that with your attorney first. Particularly if you have some fear of the perpetrator.
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As long as you are truthful nothing bad will happen to you. The State may try to use any written statement you wrote to help refresh your recollection. As long as you are honest you have nothing to fear.
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This is a simple solution -- you state what you remember, truthfully!
Faded memories happen and you will never be punished for failing to remember if that is truly the case.
Best of luck!
In no way am I offering you legal advice, and in no way has my comment created an attorney-client relationship. You are not to rely upon my note above in any way, but insted need to sit down with counsel and share all relevant facts before receiving fully-informed legal advice. If you want to be completely sure of your rights, you must sit down with an experienced criminal defense attorney to be fully aware of your rights.