The Role of the Prosecutor All serious criminal cases require the participation of three individuals: the judge, counsel for the prosecution, and counsel for the accused. If any one of these are absent from the procedure, Athe criminal justice system is incomplete@ (Congress). The prosecutor stands at a critical stage in the criminal justice system as well as playing a critical role before, during and after the trial. They serve many functions throughout the criminal process. Some of which are investigating, plead bargains, questioning both jurors and witnesses, and being involved through the s