Criteria for the temporary reintroduction of border control at internal borders
Article 26
Where a Member State decides, as a last resort, on the temporary reintroduction of border control at one or more of its internal borders or at parts thereof, or decides to prolong such reintroduction, in accordance with Article 25 or Article 28(1), it shall assess the extent to which such a measure is likely to adequately remedy the threat to public policy or internal security, and shall assess the proportionality of the measure in relation to that threat. In making such an assessment, the Member State shall, in particular, take the following into account: (a) the likely impact of any threats to its public policy or internal security, including following terrorist incidents or threats and including those posed by organised crime; (b) the likely impact of such a measure on free movement of persons within the area without internal border control.