Thomas' perceptive analysis of the decision is below. The decision (in German) can be found here, and the English press release is available here.
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The present decision concerns the classic problem of fundamental rights protection against acts of EU law that gave rise to the Solange I+II decisions. There had been rumors about an impeding “Solange III” decision for some time, but a closer look reveals that the German Constitutional Court uses a different tool out of its how-to-check-EU-law-toolbox: Identitätskontrolle. The Court held that human dignity -- as the paramount value under German constitutional law, and thus part of its constitutional identity -- needs to be safeguarded by precluding the enforcement of a European arrest warrant against an American citizen who was sentenced to 30 years in prison in absentia in Italy.