The judge is the one who listens and analyzes the evidence presented by the prosecutor, and it is who takes the decision based on his own criteria and the evidence presented. However, if the judge thinks that the evidence is inconclusive, then the accused appears before the Grand Jury, which is made up of 23 crime-free and randomly selected citizens. So, the Judge is normally who decides whether the case should go to trial, or not, and who hears first all the evidence presented by the prosecutor.