Judgment of the Court (Grand Chamber) of 5 December 2023.#Nordic Info BV v Belgische Staat.#Request for a preliminary ruling from the Nederlandstalige rechtbank van eerste aanleg Brussel.#Reference for a preliminary ruling – Directive 2004/38/EC – Articles 27 and 29 – Measures restricting the free movement of Union citizens on public health grounds – Measure of general application – National legislation providing for a ban on leaving the national territory in order to engage in non-essential travel to Member States classified as high-risk zones in the context of the COVID-19 pandemic and an obligation for every traveller entering the national territory from one of those Member States to undergo screening tests and to observe quarantine – Schengen Borders Code – Article 23 – Exercise of police powers in the field of public health – Equivalence with the exercise of border checks – Article 25 – Possibility of reintroducing border controls at internal borders in the context of the COVID-19 pandemic – Controls carried out in a Member State as part of measures prohibiting the crossing of borders for the purpose of engaging in non-essential travel from or to States in the Schengen area classified as high-risk zones in the context of the COVID-19 pandemic.#Case C-128/22.