ABSTRACT
The European Court of Human Rights Grand Chamber changed the view of 9 January 2018 with the decision of 17 October 2019 and decided that it is possible to monitor employees with a hidden camera for reasonable and serious suspicion of crime. Although the decision refers to national legislation and international documents that include the principle of transparency in data processing and envisage informing, the lack of preliminary information is only one of the criteria that should be taken into account in order to assess whether such a measure is measured in a particular case, and further assurances arising from other criteria in its lack. In this study, we will try to make the determinations by evaluating the aforementioned decision under the headings of legality, legitimacy, and compliance with democratic society requirements within the context of Article 8