Iraq has witnessed a great progress in the field of procedures followed with juvenile delinquents since the legislation of the Juvenile Law of 1955 and the end of the Juvenile Welfare Law No. 76 of 1983, which came up with rules of procedure followed with delinquent juveniles, but the question that is going on in the minds is whether the procedural rules that this law brought In the field of preliminary investigation, it is sufficient to surround the event with a fence of guarantees appropriate to the privacy of this category? In order to answer this question, we should study these rules in two separate chapters. Our first quota for criminal investigation is divided into two topics. We show in the first the investigative authority and clarify in the second the new rules that the law came up with while we deal in the second chapter with social investigation, which is limited to juveniles only. Among those interested in building it in two studies we devoted the first to the authority in charge of the investigation (the Office of Personal Study) and then we touched on the second topic to the judicial selection system and we ended our research with a conclusion that included a set of results and recommendations that we consider necessary to complete, so that we can succeed in that.