Biometric data held in the passport and identity card register or gathered under the Aliens Act could be used to prevent, detect and investigate certain types of serious offences. 

According to the proposal, these would include serious treason and espionage offences, terrorist offences, endangerment, certain offences typically linked to organised crime, and all offences for which the most severe punishment is at least six years of imprisonment. For example, those investigating homicides and serious violent and sexual offences could use biometric data as reference data.