The article is devoted to the problem of the so-called historical data, i.e. information obtained in the course of operational control, recorded on a specific data carrier before the date of ordering these operations by the court. The author focuses on the problem of understanding the concept of time of application of operational control, as well as pointing out the legitimacy of taking into account historical data from the perspective of the principle of subsidiarity. In the body of the study, the author also leans over the issue of the admissibility of such data in criminal proceedings, including making remarks against the background of historical data obtained throughout procedural activities. The article concludes with de lege ferenda proposals.
