In accordance with point 9 of the Preamble to the EIO Directive, the Slovak Republic does not apply the EIO to cross-border surveillance. According to the Slovak law (Section 113 of the Criminal Procedure Code), the surveillance of persons and items may be performed in the criminal proceedings on an intentional criminal offence if it can reasonably be assumed that it will reveal facts relevant to the criminal proceedings. The request has to be delivered in advance due to the need to issue an order, which is issued by the presiding judge, before the commencement of the criminal prosecution, or in the preliminary proceeding by the public prosecutor, who shall issue a warrant for surveillance in writing. National law regulates the situation where the case cannot be postponed and the written order cannot be obtained in advance. In this case, the order must be issued within 24 hours, otherwise the tracking must be terminated. The order allows tracking for a maximum of six months, if necessary, it can be extended in writing for another six months, even repeatedly. If the tracking lasts longer than twelve months, the order is issued by the judge for the preliminary proceeding.
Cross-border surveillance has to be executed under the legal order of the state where it was executed and documented by a process record, also video-record, audio-record, photos or any other media recording the process of operation. Surveillance has to be requested/executed under the conditions set out in the relevant international treaty. The principle of reciprocity is not applicable. Dual criminality is required.