Yes. This measure is used if it is necessary for clarification of circumstances significant for criminal proceedings to ascertain information on implemented telecommunication operation, which are otherwise subject to the telecommunication secrecy and to which the protection of personal and mediation data applies. This measure enables only tracing of telecommunications and under no circumstances tapping of the content thereof (Section 88a of the Czech Code of Criminal Procedure). This measure is available in cases referred to in Section 88a of Code of Criminal Procedure (CPC), i.e. in case of criminal proceedings concerning: a) criminal cases for which the Criminal Code prescribes a sentence of imprisonment with the upper limit of 3 or more years; b) crimes stipulated in Section 88a (1) of CPC: breach of secrecy of correspondence (Section 182 of Criminal Code), fraud (Section 209 of CC), unauthorized access to Computer systems and information media Section 230 of CC), obtaining and possession of access device and computer system passwords and other such data (Section 231 of CC), dangerous threatening (Section 353 of CC), dangerous pursuit (Section 354 of CC), spreading of alarming news (Section 357 of CC), incitement to criminal offense (Section 364 of CC), approval of criminal offense (Section 365 of CC); c) crimes, prosecution of which is stipulated in international treaties binding the Czech Republic.