The Principle of 'Ne Bis In Idem' and the Identity of the Historical Fact: The Interpretation of the Court of Cassation with Judgment No. 32057 of 2025

In the Italian legal landscape, the principle of 'ne bis in idem' represents one of the cornerstones of criminal and procedural law, ensuring that no one can be tried or punished twice for the same act. This is a fundamental guarantee, not only for the accused but also for the entire judicial system, ensuring legal certainty and preventing the infinite reopening of already decided matters. The Court of Cassation, with its recent Judgment No. 32057 of 2025, has provided a further and illuminating interpretation of this principle, focusing on the importance of the identity of the historical fact.

'Ne Bis In Idem': A Pillar of Criminal Law

The prohibition of a second trial, known as 'ne bis in idem', is enshrined in Article 649 of the Code of Criminal Procedure, which establishes that an accused person acquitted or convicted by a final judgment or criminal decree cannot be subjected to criminal proceedings again for the same act. This principle has deep roots, finding resonance not only in the Italian Constitution (albeit implicitly, through the principles of legality and defense) but also at an international and European level, such as in Article 4 of Protocol No. 7 of the European Convention on Human Rights (ECHR).

Its application, however, is not always immediate, especially when it comes to defining what exactly is meant by 'the same act'. This is where the Supreme Court intervenes, with a ruling that definitively clarifies the boundaries of this procedural preclusion.

Judgment No. 32057/2025: The Historical Fact at the Center

The judgment in question, issued by the Sixth Criminal Section and presided over by A. C., with R. A. – G. A. R. P. as rapporteur, ruled on a case involving the accused G. A., partially annulling without referral a previous decision by the Court of Appeal of Bari. The central issue concerned the existence of procedural preclusion in the presence of an acquittal judgment for drug possession and trafficking offenses, in light of a subsequent conviction for participation in a criminal association aimed at drug trafficking, based on the same material conduct.

The Court reiterated a fundamental principle:

The procedural preclusion deriving from the prohibition of 'bis in idem' operates when the historical facts already judged, considered in their historical-naturalistic dimension, are the same as those subject to the new trial, regardless of the abstract legal qualification and, therefore, of the diversity of the crimes charged in the distinct proceedings, and of the occurrence of new evidentiary acquisitions potentially capable of revisiting the acquittal judgment already rendered. (Case in which the Court held that procedural preclusion existed due to the acquittal judgment for drug possession and trafficking offenses, with respect to a subsequent conviction for participation in a criminal association aimed at drug trafficking, based on the same material conduct).

This maxim is of crucial importance. The Court of Cassation clarifies that what matters is not the legal 'label' given to the act (its qualification), but the 'historical fact' itself, in its concrete and material dimension. This means that if the material conduct that was the subject of the first and second trials is the same, 'ne bis in idem' applies, even if the crimes charged are different (e.g., drug possession versus criminal association for drug trafficking, as in the case of G. A.). Even more relevant is the assertion that even the discovery of new evidence cannot reopen a trial that has already concluded with an acquittal, unless it concerns a radically different fact.

Practical Implications: When is the Fact 'the Same'?

The orientation expressed by the Court of Cassation with Judgment No. 32057 of 2025 strengthens the protection of the accused. It is not sufficient for the Public Prosecutor (in this specific case, M. D. M.) to propose a different legal qualification of the act or to present new evidentiary elements to circumvent the prohibition. The identity of the fact must be sought in its material essence, in its 'historical-naturalistic dimension'.

This approach is fundamental to prevent an individual from being subjected to an infinite series of trials for conduct that, even if framed within different criminal offenses (such as Articles 73 and 74 of Presidential Decree 309/1990 concerning narcotics), stems from a single series of concrete events. The Court emphasizes that the diversity of the charged offenses is not sufficient to overcome the preclusion if the same material conduct is at the base. The same irrelevance is attributed to the occurrence of new evidentiary acquisitions, which cannot call into question a final acquittal judgment, except in exceptional cases of revision.

• Identity of the historical fact: Not of the legal qualification.
• Irrelevance of new evidence: Once judged, the fact is precluded.
• Protection of the accused: Protection against infinite trials.

Conclusions: Legal Certainty and Protection of the Accused

Judgment No. 32057 of 2025 by the Court of Cassation follows a consolidated line of case law but strengthens it with clarity and determination. It forcefully reiterates the principle that a person cannot be tried twice for the same material conduct, even if this is framed as different offenses or if new evidence emerges. This approach ensures the stability of judicial decisions and protects the individual from excessive state interference, ensuring that once justice has spoken its final word on a given fact, it remains so. It is an important reminder for legal professionals and a reassurance for citizens about the solidity of procedural guarantees in our legal system.