When Organic Law 5/2000 of 12 January on the criminal liability of minors was published in Article 2000, the final text to return stability to the criminal policy of young people was presented as the final text. However, when we are about to complete the five years in which the Law is in force, the fourth reform that the juvenile child justice system has undergone since then has been finalised. As shown in this Article, although the official data on juvenile delinquency does not show a significant increase in the figures, the legislator, as stated in the draft law, if it believes it and with the intention of halting this increase, has planned legislative amendments. These changes led to the adoption of new criteria for the application of the measures and the definitive incorporation of the victim into a system that should be chaired exclusively by the child. On the other hand, the results of the application of the Law presented in this Article make it possible to conclude that the trends are changing and that the judicial practice during these five years has finally polluted the punitive climate that appears to prevail throughout the criminal sphere of the country.