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Solitary confinement — a regime in which a person is deprived of meaningful social contact with other inmates — remains one of the most contested instruments in contemporary penitentiary practice. The Mandela Rules (Rule 44), CPT standards, and ECtHR case law unequivocally establish that prolonged isolation causes serious psychological harm and, in certain cases, constitutes inhuman or degrading treatment within the meaning of Article 3 of the Convention.
Yet none of these frameworks imposes an absolute prohibition, and the vast majority of states continue to maintain some legal form of solitary confinement. This contradiction constitutes the central academic problem in contemporary research on the subject.
THE FUNCTIONAL ARGUMENT: RISK MANAGEMENT
Prison administrations identify categories of individuals for whom isolation is presented as the only practically available risk-management tool: inmates facing retaliation from criminal groups (those suspected of cooperating with law enforcement, or convicted of offences against minors or sexual offences), as well as leaders of organized criminal groups capable of directing criminal activity even from within a shared cell.
From a scientific standpoint, these situations can be addressed through alternative mechanisms — prisoner reclassification, small-group regimes (step-down units), and structured therapeutic programmes. However, implementing such alternatives requires substantial resources and qualified personnel, preconditions that most prison systems lack, particularly those operating under conditions of armed conflict or transitional economies. The functional argument, therefore, is less a justification for isolation than a reflection of the systemic underdevelopment of penitentiary infrastructure.
INSTITUTIONAL INERTIA AND THE SUBSTITUTION OF PRACTICES
Even in the absence of a formal de jure prohibition, penal systems tend to reproduce isolation practices under different designations — “protective placement,” “disciplinary quarantine,” “medical isolation,” and so forth. This terminological substitution allows authorities to avoid the formal classification of a given situation as solitary confinement and, consequently, to circumvent the associated legal safeguards.
Rule 44 of the Mandela Rules caps the permissible duration of isolation at fifteen days. However, this standard becomes a declarative norm in the absence of independent monitoring and effective enforcement mechanisms. A paradox thus emerges: a formal prohibition is enshrined in legislation, while functional isolation persists de facto. This gap between norm and practice constitutes one of the principal obstacles to any genuine abolition of the regime.
THE POLITICAL ECONOMY OF SECURITY
Reforming isolation regimes requires political will — a will that runs counter to the prevailing electoral logic of being “tough on crime.” Prison administrations rely on isolation as their primary disciplinary instrument; prison officers’ unions actively resist reform on the grounds of staff safety; and legislators invoke stringent isolation regimes as a symbolic response to high-profile crimes.
This symbolic function of solitary confinement — demonstrating state intransigence toward criminality — constitutes an independent factor in its preservation, one that operates irrespective of any actual penological rationale. It reveals that the debate surrounding isolation is, to a considerable extent, not a debate about security at all, but about the symbolic politics of punishment.
CONCEPTUAL UNCERTAINTY: THE PROBLEM OF DEFINITION
A further obstacle to an outright prohibition is the absence of a single, authoritative definition of solitary confinement. The CPT, the Mandela Rules, and the ECtHR apply different criteria: the number of hours spent outside the cell, the nature of social interaction (with other prisoners or with staff only), and duration — since short-term and chronic isolation are qualitatively distinct phenomena with different psychological consequences.
This conceptual ambiguity affords states considerable room for definitional manipulation: while formally abolishing “solitary confinement,” they may continue the practice of functional isolation that does not meet the formal criteria of the prohibited regime.
THE POSITION OF THE EUROPEAN COURT: NO ABSOLUTE PROHIBITION
It bears emphasis that the Convention itself establishes no absolute prohibition on solitary confinement as such. In Öcalan v. Turkey, Rohde v. Denmark, and Ramirez Sanchez v. France, the Court assessed the overall conditions of detention rather than treating isolation as a separately prohibited act. A violation of Article 3 was found only where complete sensory deprivation was established, where the regime had been applied for an excessive duration, or where it had been imposed without any judicial or prosecutorial oversight.
This approach — focused on a comprehensive assessment of the circumstances — leaves states with significant latitude and complicates the development of a clear, operationally applicable legal standard at the level of national penitentiary systems.
CONCLUSIONS: THE PARADOX OF PRESERVATION
The foregoing analysis yields a key penological paradox: solitary confinement persists not because it is effective — no scientifically verified data supports any rehabilitative function of the isolation regime, while its destructive psychiatric consequences are extensively documented — but because it is convenient: as a disciplinary instrument for prison administrations, as a symbol of rigorous criminal policy, and as a substitute for systemic reform in the face of chronic resource constraints.
Complete abolition would require not merely a legal norm but a profound restructuring of the entire logic of imprisonment — a transition from a custodial to a rehabilitative model entailing large-scale investment in infrastructure, staff retraining, and a fundamental shift in public expectations regarding the purposes of punishment. Until that transformation occurs, solitary confinement will remain a de facto component of penitentiary systems, irrespective of how it is designated de jure.
