Prosecutors won't generally pursue a conviction unless they think they have a strong case, so finding witnesses to support your innocence can help you in many ways. A witness for the defense may provide a more impartial version of the events in question, or verify that you were acting in self defense. A witness may testify that you were somewhere else while the crime was taking place. And, though a case is rarely dropped at the request of victims, in some cases, a victim may be persuaded to testify on your behalf. Read more about how witnesses may help prove your innocence if you were falsely accused of assault.