Explore the affidavit of nonprosecution, its legal implications, and potential future developments in criminal cases. It's an affidavit that is written from the complaining witness in a case given to the district attorney's office.A written statement from a victim asking the district attorney's office to dismiss a case against a defendant in almost all cases. You are going to testify about some information you have about a criminal case. Your honest and complete testimony about the case is very important. Customer: I need to find an affidavit of non prosecution for il. Lawyer's Assistant: Have you talked to an IL lawyer about this? How do i go about filling out an affidavit of non prosecution? Is there a form i can fill out or a certain wording required? Navigating a Texas Affidavit of Non-Prosecution for Domestic Violence: A Step-by-Step. Guide.