For tens of thousands of people incarcerated in the United States, punishment can mean spending 22 or more hours a day alone in a cell barely larger than a parking space, with little human contact, limited recreation, and few opportunities for education or rehabilitation.
The practice is known by many names — solitary confinement, restrictive housing, administrative segregation, disciplinary segregation or special housing. Whatever the terminology, decades of research have linked prolonged isolation to severe psychological and physical harm, particularly among people with mental illness or intellectual disabilities.
Hallucinations, paranoia, insomnia, panic attacks, impaired memory, uncontrollable anger, and increased suicide risk have all been associated with prolonged isolation. Researchers have also found evidence that the consequences can persist after prisoners return to the general population or leave prison altogether.
The United Nations’ Nelson Mandela Rules define prolonged solitary confinement as isolation for more than 15 consecutive days and prohibit its indefinite or prolonged use.
Yet solitary confinement remains part of the American correctional system.
Estimates cited by researchers have placed the number of people who had spent at least 15 consecutive days in solitary confinement in state and federal prisons on a given day at between 55,000 and 62,500. Precise nationwide comparisons remain difficult because correctional systems use different terminology and the United States lacks a single comprehensive reporting system covering prisons, jails, juvenile facilities and immigration detention centers.
Pennsylvania faced federal scrutiny
The dangers are particularly acute for prisoners with serious mental illness.
The U.S. Department of Justice reached that conclusion more than a decade ago after investigating Pennsylvania’s prison system.
The federal inquiry grew from an investigation of the State Correctional Institution at Cresson, where investigators identified constitutional and civil rights violations involving prisoners with serious mental illness and intellectual disabilities. The Justice Department subsequently expanded its review to Pennsylvania’s state prison system.
Federal investigators concluded that Pennsylvania’s use of prolonged isolation for prisoners with serious mental illness and intellectual disabilities violated constitutional protections and raised concerns under the Americans with Disabilities Act.
Investigators also identified problems involving full-body restraints, inadequate mental health treatment, unsanitary conditions, and staff conduct.
The findings were especially significant because more than 20% of Pennsylvania prisoners at the time were reported to have a mental illness or intellectual disability, with roughly 7% to 10% considered to have a serious mental illness.
Federal investigators nevertheless acknowledged improvements by Pennsylvania corrections officials during the investigation and attributed many of the problems to systemic deficiencies that impaired the department’s ability to provide adequate mental health treatment.
Then-Corrections Secretary John Wetzel said the state was training thousands of correctional employees in mental health first aid, increasing crisis intervention training and licensed mental health staffing, and developing peer-support programs.
Pennsylvania also began moving prisoners with serious mental illness away from conventional solitary confinement and toward programs offering substantially more time outside their cells.
The underlying problem, however, extends far beyond Pennsylvania.
Isolation can become its own punishment
Correctional officials have traditionally defended restrictive housing as necessary to protect prisoners and staff, control violence, manage gangs and discipline people who violate institutional rules.
Critics contend that solitary confinement is frequently imposed for far less serious reasons and sometimes used to manage people whose behavior stems from untreated psychiatric illness.
That can produce a destructive cycle.
A prisoner experiencing psychiatric symptoms behaves erratically, violates institutional rules and is placed in isolation. Isolation aggravates the prisoner’s condition, producing additional behavioral problems that can lead to more disciplinary sanctions and more isolation.
Research has associated prolonged social isolation with changes in cognition, memory and emotional regulation. Some people develop hypersensitivity to ordinary sounds and physical sensations. Others experience hallucinations, severe anxiety, paranoia or difficulty distinguishing their perceptions from reality.
People who entered isolation without a diagnosed psychiatric disorder can emerge with serious symptoms.
Suicide represents one of the gravest concerns. Research and correctional studies have repeatedly found prisoners held in restrictive housing disproportionately represented among prison suicides and incidents of self-harm.
Evidence also suggests that the danger does not necessarily end at the prison gate. Studies have linked exposure to solitary confinement with elevated risks of premature death after release, including suicide, homicide and drug overdose.
Debate renewed by federal detention case
The controversy has gained renewed attention in 2026 as courts consider allegations about conditions inside federal detention facilities.
A Sept. 3 commentary by criminal justice journalist Chandra Bozelko described allegations involving Andrew and Tristan Tate, who have been fighting extradition to England while detained at the Federal Detention Center in Miami.
Their lawyers contend the brothers have been subjected to solitary confinement. Federal prosecutors dispute that characterization of their conditions, describing them as reasonable and constitutional. The defense has described substantially more restrictive conditions, including five hours of recreation each week and limited telephone and commissary access.
The dispute illustrates a broader problem in defining solitary confinement. Correctional institutions do not always call restrictive housing “solitary,” and arguments frequently arise over how much time outside a cell or how much interaction with others distinguishes restrictive detention from isolation.
Bozelko argued that opposition to prolonged isolation cannot depend on whether the prisoner subjected to it is sympathetic. “Neither does isolation,” she wrote after describing an incident in which pepper spray allegedly spread through the housing unit into neighboring cells.
That principle lies at the center of the larger debate.
Human rights protections are not rewards for good behavior, and constitutional protections do not disappear at a prison door.
Prisons unquestionably have a responsibility to protect correctional employees and incarcerated people from violence. At times, officials may need to separate a dangerous individual from others.
The question is whether separation must mean prolonged sensory and social deprivation — and whether practices developed in the name of institutional security ultimately create greater psychiatric, medical and public safety problems.
For people with serious mental illness, the evidence accumulated over decades presents an especially stark warning: Putting a psychologically vulnerable person alone in a cell for weeks or months does not treat the underlying illness.
It can make it considerably worse.
And when prisoners eventually return to their families and communities, the consequences of what happened inside those cells can return with them.
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