Abstract
The obligation of telecommunications network operators to retain traffic and location data had already been known to the Czech legal system before the infamous data retention directive came into force. The original data retention legislation was even repealed by the Constitutional Court of the Czech Republic before the judgment of the Court of Justice of the European Union, popularly called
Digital Rights Ireland. However, the new version of the legislation was reviewed again by the
Constitutional Court of the Czech Republic, but this time the legislation was found to be in line with the constitutional order. However, the question remains whether the Czech legislation is compatible with EU law, as the CJEU has already given some guidance in several cases on the admissibility of the nationwide retention of telecommunications metadata.