Recital (29)

Personal data should be collected for specified, explicit and legitimate purposes within the scope of this Directive and should not be processed for purposes incompatible with 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. If personal data are processed by the same or another controller for a purpose within the scope of this Directive other than that for which it has been collected, such processing should be permitted under the condition that such processing is authorised in accordance with applicable legal provisions and is necessary for and proportionate to that other purpose.