The Court of Audit believes that, from the point of view of legal certainty and equality before the law, the Ministry of Justice should introduce clear guidelines for registration purposes. Moreover, failure to solve practical problems and unfamiliarity with the criteria for registering descriptions often means that the NSIS is not expoited to the full. The Court of Audit recommends that information on the possibilities of the NSIS be improved, along with consultation on and harmonisation of registration criteria at national level, and that specific agreements be made on this subject. The use of the NSIS in controls at Dutch external borders is not at present systematic. It has been agreed at Schengen level that in harbours and at airports, aliens from outside most European Union countries should be subjected to thorough controls, including NSIS checks.
Different rules apply to passengers in transit.
The controls carried out by the Royal Military Constabulary do not meet the requisite level of intensity. Moreover it emerged that the Royal Military Constabulary did not have any reliable figures on the numbers of individuals requiring thorough checks. The Court of Audit believes that the Ministry of Justice must provide the Royal Military Constabulary with better guidelines on this point. Since the NSIS has not been in existence very long, the Court of Audit is aware that 'teething troubles' will inevitably affect its operation and use. However, given the confidentiality of the data in question and the risk posed by defects, the Court of Audit would emphasise the importance of improving the NSIS and especially its use as soon as possible.