Unfortunately, a mandatory part of the process is the completion of the application to the best of your ability. Having said that, there are ways that you can complete the form. For example, you mentioned that you do not recall the prosecutor involved in the case. As to that, simply list the office that handled the prosecution. For example, you might list "Linn County Office of the Prosecuting Attorney".
In short, you will need to fill out the application to the best of your ability to obtain the requested relief.
Please let me know if anything requires clarification.
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