The police officers involved write reports about the crime, obtain witness statements, run a background check of the suspect, and do further investigation as needed before submitting their work to an investigating detective. Often, this is they most propitious time for a California Criminal Defense Lawyer to make a dramatic impact in a Pre-Filing Intervention, as the police usually know very little about the person arrested. The police then bring their written investigation to the District Attorney's Office. A prosecutor reviews the documents to determine whether criminal charges – a misdemeanor or a felony – are warranted. The prosecutor has the option of rejecting the case for criminal prosecution, filing a misdemeanor, or filing a felony charge.