
Types of Solitary Confinement – Key Points
- Court-ordered (pre-trial) – Justified only to protect the investigation; must be evidence-based, individual, and subject to safeguards. Courts should not impose solitary as part of a sentence — that power belongs to prison authorities.
- Disciplinary – Used as a last resort, for the shortest possible time. CPT recommends a maximum of 14 days per offence; sequential sentences that exceed this limit should be prohibited.
- Administrative/preventative – Applied to prisoners posing serious risk to others or to prison security; can last years. Has the fewest safeguards, so strict rules against overuse are essential.
- Protective – For prisoners vulnerable to harm from others (due to offence type, debts, gang conflicts, etc.). May be self-requested or management-initiated; once placed, it is often very hard for the prisoner to leave protection status.
Types of Solitary Confinement and Their Legitimacy
There are four main situations in which solitary confinement is used. Each has its own rationale, and each should be viewed differently:
Solitary confinement as the result of a court decision
In most countries, courts have the power to order that a person remanded in custody (i.e. placed in pre-trial detention) be held for a certain period in solitary confinement, in the interests of the criminal investigation. Further, in a few countries, a period of solitary confinement is an automatic part of some sentences established by legislation or can be ordered by a court as part of a sentence.
In relation to solitary confinement ordered by a court as part of remand conditions, it is axiomatic that there may be justification, in an individual case and based on sufficient evidence, for keeping a given remand prisoner apart from other particular prisoners or, in even more exceptional circumstances, prisoners in general, and in restricting his/her contact with the outside world. This should only be done to guard against a real risk to the administration of justice and must be subject to the safeguards.
The CPT considers that solitary confinement should never be imposed – or be imposable at the discretion of the court concerned – as part of a sentence. The generally accepted principle that offenders are sent to prison as a punishment, not to receive punishment, should be recalled in this context. Imprisonment is a punishment in its own right and potentially dangerous aggravations of a prison sentence as part of the punishment are not acceptable. It may be necessary for a sentenced prisoner to be subject, for a certain period of time, to a solitary confinement regime; however, the imposition of such a regime should lie with the prison authorities and not be made part of the catalogue of criminal sanctions.
Solitary confinement as a disciplinary sanction
Withdrawal of a prisoner from contact with other prisoners may be imposed under the normal disciplinary procedures specified by the law, as the most severe disciplinary punishment. Recognising the inherent dangers of this sanction, countries specify a maximum period for which it may be imposed. This can vary from as little as a few days to as much as a month or more. Some countries allow prison directors to impose a given maximum period, with the possibility for a judicial body to impose a longer period. Most countries – but not all – prohibit sequential sentences of solitary confinement.
Given the potentially very damaging effects of solitary confinement, the CPT considers that the principle of proportionality requires that it be used as a disciplinary punishment only in exceptional cases and as a last resort, and for the shortest possible period of time. The trend in many member States of the Council of Europe is towards lowering the maximum possible period of solitary confinement as a punishment. The CPT considers that the maximum period should be no higher than 14 days for a given offence, and preferably lower.3 Further, there should be a prohibition of sequential disciplinary sentences resulting in an uninterrupted period of solitary confinement in excess of the maximum period. Any offences committed by a prisoner which it is felt call for more severe sanctions should be dealt with through the criminal justice system.
Administrative solitary confinement for preventative purposes
The law in most European countries allows for an administrative decision to place into solitary confinement prisoners who have caused, or are judged likely to cause, serious harm to others or who present a very serious risk to the safety or security of the prison. This may be for as short as a few hours, in the case of an isolated incident, or for as long as a period of years in cases involving prisoners who are considered as particularly dangerous and to continue to pose an imminent threat.
This is potentially the longest lasting type of solitary confinement and often the one with the fewest procedural safeguards. It is therefore crucial that there be rules to ensure that it is not used too readily (e.g. as an immediate response to every disciplinary infraction pending adjudication), too extensively or for too lengthy periods. Accordingly, the safeguards must be rigorously followed.
Solitary confinement for protection purposes
Every prison system has prisoners who may require protection from other prisoners. This may be because of the nature of their offence, their co-operation with the criminal justice authorities, inter-gang rivalry, debts outside or inside the prison or the general vulnerability of the person. While many prisoners can be managed in the general prison population in these circumstances, the risk to some is such that the prison can only discharge its duty of care to the individuals by keeping them apart from all other prisoners. This may be done at the prisoner’s own request or at the instigation of management when it is deemed necessary. Whatever the process, the fact is that it can be very difficult for a prisoner to come off protection for the rest of the sentence – and maybe even for subsequent sentences.