If you need to write a character reference for someone charged with a drink driving offence, our guide will teach you how to write an effective one. Discuss the positive aspects of the defendant's life.For example, if you are an employer, you can discuss the defendant's job performance. I am writing this character letter on behalf of Sean McDevitt who has been charged with a DUI and injury to another person. Free template for a character reference letter for a DUI charge! A character letter to a judge should establish your credibility, paint a full picture of the defendant and be respectful, among other things. Sample Format for a Character Letter. If you have been asked to write a character letter, this simple template may be a useful guide. Learn if the defendant has been convicted of this criminal offense in the past. He was ordered to complete substance-abuse treatment in connection with the 1997 DUI.