Explore the affidavit of nonprosecution, its legal implications, and potential future developments in criminal cases. An affidavit is nothing more than a signed and notarized letter.Filling out an affidavit of non-prosecution in Texas is pretty straight-forward. It should state that the victim doesn't want to cooperate or prosecute. How to file an affidavit of non prosecution in Texas? 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? To fill out this affidavit, you'll need to provide your personal information, details about the incident, and your desire to withdraw the charges. And I am 18 years of age or older. 1. Provide your name and employment details.