The Principle of 'Ne Bis In Idem' and Preventive Measures: Cassation Judgment 29437/2025

The "ne bis in idem," a cornerstone legal principle prohibiting double jeopardy for the same offense, finds peculiar application within the realm of preventive measures. The Court of Cassation, in Judgment No. 29437 of 14/07/2025, has provided crucial clarifications on the reassessment of social dangerousness. This ruling, concerning the case of M. A. and with Public Prosecutor S. G., annulling with referral a decision by the Court of Appeal of Naples, outlines a delicate balance between the finality of a judgment and the protection of the community.

The "Ne Bis In Idem": A Guarantee with Its Limits

Established by Article 649 of the Code of Criminal Procedure (c.p.p.) and Article 4 of Protocol No. 7 of the ECHR, the "ne bis in idem" protects individuals from repeated trials. However, its application is not absolute, especially for preventive measures, which, while not criminal sanctions, restrict liberty based on a prognosis of future dangerousness.

Preventive Measures: Their Nature and the Need for Reassessment

Regulated by Legislative Decree 159/2011 ("Anti-Mafia Code"), preventive measures are tools aimed at combating crime by restricting the liberty or assets of individuals deemed socially dangerous. They act preventively. The key question is: can an individual subject to a revoked preventive measure be subject to it again if new elements emerge?

Judgment 29437/2025: The Preclusion of Judgment "Rebus Sic Stantibus"

The Cassation ruling, with President Dr. R. P. and rapporteur Dr. C. F., clarifies the applicability of "ne bis in idem" in matters of prevention, but with a fundamental clarification.

In the context of preventive measures, the principle of "ne bis in idem" is applicable, but the preclusion of a judgment operates only "rebus sic stantibus." Therefore, if further elements are acquired, whether prior or subsequent to the judgment, but were not evaluated, this does not prevent the reassessment of dangerousness for the purpose of applying a personal or patrimonial measure that was previously revoked.

This maxim is illuminating: a judgment precludes only "as things stand." If "further elements" emerge, even if pre-existing but not considered, the situation can be re-examined. This prevents an incomplete assessment from hindering measures necessary for public safety, in line with previous consistent rulings (No. 47233 of 2016 and No. 600 of 2010, United Sections).

Cases allowing for a new assessment include:

• Acquisition of new elements, even if they pre-dated the judgment but were not considered.
• Emergence of facts subsequent to the revocation indicating renewed dangerousness.
• Incomplete original assessment due to the failure to consider relevant data.

Conclusions: The Balance Between Guarantee and Public Safety

Judgment No. 29437 of 2025 reiterates that the protection of the community and the prevention of crime cannot be hindered by a rigid interpretation of "ne bis in idem" when social dangerousness is dynamic. The principle guarantees legal certainty but cannot disregard new circumstances. Understanding this nuance is crucial in the complex landscape of preventive measures.