In order for public service to be provided and to be carried out in accordance with the law, it is necessary to elect suitable persons to public office who are able to carry out this duty properly. One of the ways to ensure this is to conduct both a security investigation and an archive research on those who will enter public office for the first time or again. In our study, the concepts of security investigation and archive research, which have become very important in our law, especially for public officials, will be emphasized. Apart from the fact that these studies address the decisions made in the criminal procedure process, the issue should also be addressed from the perspective of criminal law, as the criminal acts committed by individuals are also reflected in these studies. In 2018, a new provision was added to the first article of Law No. 4045, granting the authorities conducting security investigations and archive searches a broad authority to access all kinds of information and documents in other administrative authorities, court decisions and facts subject to criminal investigations and prosecutions. However, the Constitutional Court, through abstract review of norms, annulled these regulations as unconstitutional. The absence of a provision in the law on the protection of personal data in security investigations was the main factor in the Constitutional Court's annulment decisions. The Law No. 7315 on Security Investigation and Archival Research was prepared by taking into account the justifications in the Constitutional Court decisions in order to eliminate the existing legal gap.