Both in Dutch migration law and criminal law, entry bans, provided for in the Return Directive, play a significant role. The length of an entry ban may exceed five years if the third-country national represents a serious threat to public policy, public security or national security. This article focusses on the definition of ‘serious threat to public policy’ and elaborates on the relevant moment in time in judicial proceedings before the administrative and criminal courts.

At EU level, the use of substantive criminal law as a response to illegal migration is materialised by both the EU legislator and the Member States individually. EU involvement in criminalizing illegal migration takes place in a twofold manner: directly, through harmonization of national legislations, and indirectly, through the case law of the Court of Justice of the European Union (CJEU). An example of the latter is the case law of the CJEU regarding criminal law sanctions for breaching an entry ban. In this article, we will analyse judgments of the CJEU in the light of crimmigration law and make a distinction between the Member States’ power to classify a breach of an entry ban as an offence and to lay down criminal law sanctions in national legislation, and their power to impose such sanctions.