I would either speak to the victim's advocate first, or the actual prosecutor. And let them know just that - that you don't want to see prosecution occur.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? And I am 18 years of age or older. Finding yourself entangled in legal proceedings can be daunting. How do I file an affidavit for nonprosecution without a lawyer, for a domestic violence case? Understanding Philadelphia's criminal justice process and system. The prosecutors has to prove your supposed guilt. I am the complaining witness against.