15 (3) Data from the Suspect Data System referred to in section 4 may not be used for the performance of the duties referred to in subsection 1(5). Section 17 Supplying data to another police unit for a purpose equivalent to data collection and recording (1) A police unit may supply data from a police personal data file established for more restricted use than nationwide use to another police unit for the performance of duties laid down in section 1(1) of the Police Act if the data is necessary for the performance of the duties in question. (2) Information as referred to in section 12 may, however, only be supplied if the information is necessary: 1) for ensuring State security; 2) for countering an immediate danger threatening life or health or for preventing significant damage to property; 3) for preventing or investigating an offence subject to imprisonment; 4) for preventing and investigating crime within the jurisdiction of the European Police Office, or some other serious crime. (3) A police unit may supply data from a personal data file established for more restricted use than nationwide use to another police unit for the performance of duties laid down in section 1(3) of the Police Act if the data is necessary for the performance of the duty for which the data was collected and recorded. (4) Notwithstanding any secrecy provisions, the data may also be supplied with the aid of a technical interface or in machine-readable form. Section 18