A lot of criminal cases begin with an arrest. After the arrest, the police will make a report that summarizes the events leading up the arrest. The police will then send the arrest report to a prosecutor. It is the job of the prosecutor to initiate and prosecute criminal cases utilizing one of three possible methods. He may decide that the case should be charged (as a felony or a misdemeanor), and file a complaint with the trial court or decide that the matter should not be pursued. The third option is to decide that the case should be charged as a felony and bring evidence before citizens serving as grand jurors, who will decide what charges, if any, to file.
The Role of a Grand Jury