In most cases, an Assistant District Attorney in the Complaint Room (ECAB) will review the facts with the arresting officer and sometimes with the complainant or other witnesses. The ADA will then determine the sufficiency of the evidence to support the charges originally brought by the police, determine the final charges, and draft the complaint upon which the defendant will be prosecuted. The complaint must allege facts providing reasonable cause to believe that the person charged committed specific offenses. In some instances, after evaluating the evidence, the District Attorney's Office will decline to prosecute a case. A case is ready for arraignment when the complaint has been filed, the defendant has been interviewed by the attorney, and the defendant's criminal history is available.