The law ferenda, as far as the author’s concern (the person or institution), was designed in four systems that trigger the legal proceedings in matters of committed crime: the prosecution that comes from the victim or his heirs (private prosecuting); prosecution that comes from any citizen, acting on behalf of the society (popular prosecuting); prosecution that comes from the judges themselves (pursuit of ex officio); finally, the prosecution comes from specialized officials as magistrates of the Public Ministry (public prosecuting) or officials of certain administrations. For the law lata, first of all it must be underlined the preeminent role of the police, role more or less important in the development of the activity, but most often they are the first one that are informed.