On 11 May 2016, the European Parliament adopted a new regulation for Europol, which will enter into force on 1 May 2017. This Regulation establishes the – so far unprecedented political accountability mechanism in the EU – Joint Parliamentary Scrutiny. The introduction of a mechanism, which links political accountability fora of the EU and the national levels, is a revolutionary development for the evolving multi-level accountability system (of EU agencies). To enhance democratic legitimacy of the EU structures and decisions, the legislative and accountability roles of the European Parliament have grown significantly in the last decennia (Scholten 2014). Yet, never before did national parliaments become involved in holding EU entities to account, too.