Recital (15)

In order to ensure the same level of protection for natural persons through legally enforceable rights throughout the Union and to prevent divergences hampering the exchange of personal data between competent authorities, this Directive should provide for harmonised rules for the protection and the free movement of personal data processed for the purposes of the prevention, investigation, detection or prosecution of criminal offences or the execution of criminal penalties, including the safeguarding against and the prevention of threats to public security. The approximation of Member States' laws should not result in any lessening of the personal data protection they afford but should, on the contrary, seek to ensure a high level of protection within the Union. Member States should not be precluded from providing higher safeguards than those established in this Directive for the protection of the rights and freedoms of the data subject with regard to the processing of personal data by competent authorities.