Effective prevention of criminality is impossible without the use by the competent authorities of a complex of special measures, means and methods outside the limits of the criminal proceeding. The special investigative activity, by the use of its methods, means and forces, contributes directly to the prevention and detection of the offences, to the ensuring of the return of the damage caused as a result of the offense, the search for the persons that are hiding from the criminal investigation authorities, from the court or are evading the criminal sanction and of the missing persons. The practice accumulated in the domain of the prevention and control of criminality and assurance of the legal norms proves that namely by means of the implementation of special investigative measures it is possible the timely identification of criminal intentions, of the actions of the preparation of the offence as well as of the attempted crimes. The special investigative activity consists in the realization of a wide range of measures oriented inclusively to the detection of the indices of criminal activity.