It is possible to determine the contents of undelivered telegrams, letters or other consignments for the clarification of facts important to criminal proceedings, that originate from the accused or are addressed to them. An order is essential for such investigative measure, issued by the presiding judge and, prior to the onset of the criminal prosecution or in the preliminary hearing, the public prosecutor, or, with their consent, a police officer. The order is issued for the post office or the legal entity responsible for their transportation to release them.
In criminal proceedings on crimes, corruption, a criminal offence of the abuse of authority of a public official and the criminal offence of money laundering, an order may be issued for the post office or the legal entity who performs the transportation of the consignments to release the consignment for which there is a justified suspicion that it was used for the commission of a criminal offence or it relates to such criminal offence, if it is necessary to determine its contents to clarify the facts important to the criminal proceedings (Section 108 of the Criminal Procedure Code).
After the order is issued, the consignment may be opened only by the presiding judge and, in the preliminary hearing, the public prosecutor or the police officer with the prior consent of the judge for the preliminary hearing (Section 109 of the Criminal Procedure Code).