http://dx.doi.org/10.17176/20210625-193249-0 https://staging.verfassungsblog.de/the-guardian-is-absent/ The Guardian is Absent Cebulak, Pola Morvillo, Marta eng 2021-06-25 electronic resource text/html ddc:342 border control European Commission Schengen Verfassungsblog Verfassungsblog--2366-7044 CC BY-SA 4.0 What limits does European Union (EU) law impose on Member States invoking national security to temporarily re-introduce border controls within the Schengen Area? This question will be answered soon by the European court of Justice (ECJ) in the joined cases C-368/20 NW v Landespolizeidirektion Steiermark and C-369/20 NW v Bezirkshauptmannschaft Leibnitz.