As indicated in recital 115, any data collection as part of a coercive investigation must be specifically authorised by law and may only be carried out based on a court warrant "issued for adequate cause" (Article 35 of the Constitution). As regards the investigation of criminal offences, this requirement is reflected in the provisions of the Code of Criminal Procedure ("CCP"). According to Article 197(1) of the CCP, compulsory measures "shall not be applied unless special provisions have been established in this Code". With respect to the collection of electronic information, the only relevant (82) legal bases in this regard are Article 218 of the CCP (search and seizure) and Article 222-2 of the CCP, according to which compulsory measures for the interception of electronic communications without the consent of either party shall be executed based upon other acts, namely the Act on Wiretapping for Criminal Investigation ("Wiretapping Act"). In both cases, the warrant requirement applies.

Moreover, in order to allow the Commission to effectively carry out its monitoring function, the Member States should inform the Commission about any relevant action undertaken by the national data protection authorities ("DPAs"), in particular regarding queries or complaints by EU data subjects concerning the transfer of personal data from the European Union to business operators in Japan. The Commission should also be informed about any indications that the actions of Japanese public authorities responsible for the prevention, investigation, detection or prosecution of criminal offences, or for national security, including any oversight bodies, do not ensure the required level of protection.