Law enforcement does not always act correctly. For example they may be careless with your information, or take much too long to deal with your case. Sometimes they breach the law themselves, for example if the police uses excessive force against you. It can also happen that public authorities (such as the police, but also the General Intelligence and Security Service (Algemene Inlichtingen- en Veiligheidsdienst, or ‘AIVD’)) may exceed its powers and thereby breach citizens’ fundamental rights.
It is possible to submit a complaint about this. In certain cases it is also possible to hold the authorities concerned liable in a civil case. In exceptional circumstances it is possible to file a criminal complaint against the officials concerned.