DIRECTIVE (EU) 2016/680 DIRECTIVE (EU) 2016/680 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL on the protection of natural persons with regard to the processing of personal data by competent authorities for the purposes of the prevention, investigation, detection or prosecution of criminal offences or the execution of criminal penalties, and on the free movement of such data, and repealing
DIRECTIVE 2002/58/EC DIRECTIVE 2002/58/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL concerning the processing of personal data and the protection of privacy in the electronic communications sector (Directive on privacy and electronic communications)
Guidelines, Recommendations and best practices regarding personal data protection (European Data Protection Board) https://edpb.europa.eu/our-work-tools/general-guidance/gdpr-guidelines-recommendations-best-practices_en