Solitary Confinement and Mental Health: Evidence and Risks

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Author: Ukrainian Psychological Hub · Published: October 11, 2026 · Editorial Policy

Solitary confinement is a form of restrictive incarceration in which a person spends most of the day in a cell and has little opportunity for meaningful human contact. Its consequences for mental health are an important question in correctional psychology, prison medicine, public health, and human-rights law. Research has linked solitary confinement with psychological distress, psychiatric symptoms, self-harm, and some mortality outcomes. The evidence is substantial enough to guide prevention and clinical safeguards, although studies differ in their definitions, methods, comparison groups, and ability to identify causation. The 2020 systematic review by Luigi and colleagues and the 2025 review of disciplinary confinement establish the principal empirical starting points.

The essential distinction is between what research shows about populations and what can be concluded about a particular person. A higher average symptom score is evidence about a group; a clinical diagnosis requires individual evaluation. An association with self-harm is a reason for careful prevention; it does not yield a probability for every person placed in isolation. Similarly, the legal permissibility of a particular placement depends on the jurisdiction and circumstances rather than a psychological study alone.

What is solitary confinement?

Rule 44 of the United Nations Standard Minimum Rules for the Treatment of Prisoners, known as the Nelson Mandela Rules, defines solitary confinement as confinement for 22 hours or more a day without meaningful human contact. It defines prolonged solitary confinement as more than 15 consecutive days. These standards provide a shared international vocabulary, while the terminology and legal rules used by national correctional systems differ. The text was adopted by the United Nations General Assembly in 2015; see the official UN resolution record and the UN explanation of the Mandela Rules.

A unit may instead be described as restrictive housing, disciplinary segregation, administrative segregation, protective custody, special housing, intensive management, or supermax confinement. These labels describe different operational arrangements. The amount of time out of a cell, opportunity for conversation, availability of services, duration, and freedom of movement are often more informative for psychological assessment than the institution's chosen label. The US Department of Justice's restrictive-housing review explains why correctional terms should be examined carefully.

Does living alone always count as solitary confinement?

Physical separation and social isolation are different properties of an environment. A person living alone while exercising choice over movement, employment, friendships, and everyday activity experiences something very different from a person confined behind a locked door for nearly the entire day. Some prison cells are shared, yet occupants may still lack meaningful reciprocal contact with others. Researchers therefore need to measure the lived conditions rather than treating cell occupancy as an adequate proxy for social deprivation.

Administrative, disciplinary, and protective segregation

Disciplinary confinement usually follows an institutional adjudication of alleged misconduct. Administrative segregation may involve investigations, classification decisions, or security concerns. Protective segregation is intended to reduce exposure to violence or intimidation. The purposes differ, but each may restrict human interaction, exercise, rehabilitation programs, and normal routines. The distinction also affects interpretation: a person placed in a protective unit may already be exposed to unusual threats, while someone placed after serious misconduct may have had problems predating the placement.

What is the difference between solitary confinement and clinical seclusion?

Clinical seclusion, where permitted, is a medically governed intervention used for a specific and immediate clinical purpose under requirements concerning authorization, duration, supervision, and monitoring. Punitive or administrative segregation is a correctional intervention. A unit does not become therapeutic because its staff use clinical terminology. The National Commission on Correctional Health Care states that isolation for clinical purposes should be professionally ordered, closely supervised, brief, and conducted in an appropriate clinical area.

What does the scientific evidence show overall?

The central research finding is an association between solitary confinement and worse mental-health outcomes in a number of incarcerated populations. Studies commonly assess anxiety, depression, psychological distress, hostility, psychosis-like experiences, self-injurious behavior, and related service needs. Some studies also examine events after prison release. Results are not identical across samples, and the strength of a causal conclusion varies by design.

In their 2020 systematic review and meta-analysis, Luigi and colleagues identified 13 eligible studies representing 382,440 incarcerated individuals, approximately 23% of whom had experienced solitary confinement under the included studies' definitions. Across five studies involving 4,517 people, the pooled standardized mean difference for overall psychological symptoms was 0.45, with a 95% confidence interval of 0.29 to 0.61. Separate pooled analyses found elevations in mood, psychotic, and hostility symptoms. These are differences between study groups on symptom measures, not diagnostic prevalence estimates.

A 2025 systematic review by Giguère and colleagues focused specifically on disciplinary confinement. Six studies involving 171,300 incarcerated people examined psychological outcomes and found greater distress, psychiatric symptoms, self-harm, mental-health service use, and hospitalization in several study comparisons. Outcome definitions and methods were too heterogeneous for a single pooled psychological-effect estimate. The review thus reinforces clinical concern while showing that one headline number cannot adequately summarize the field.

Why do reviews reach qualified conclusions?

The observed difference between groups can reflect exposure to isolation, but it can also reflect preexisting psychiatric symptoms, institutional misconduct, victimization, disciplinary selection, prior trauma, substance-related problems, and the conditions of incarceration outside segregation. Good studies attempt to account for these factors. Their ability to do so depends on available baseline measurements and the timing of observations. The research includes strong signals of harm alongside unresolved questions about which conditions and durations produce particular outcomes.

Depression, anxiety, and emotional distress

People living under severe isolation may experience persistent sadness, worry, irritability, emotional dysregulation, helplessness, hopelessness, or difficulty adapting to daily uncertainty. These reactions can arise in people without a previously diagnosed mental illness and can occur alongside an established condition. The Luigi et al. analysis reported a pooled standardized mean difference of 0.41 for mood symptoms, a finding that concerns measured symptom severity rather than the incidence of major depressive disorder.

Clinical assessment asks whether symptoms represent a new syndrome, an exacerbation of a preexisting condition, an acute response to stress, medication or substance effects, or several interacting contributors. Onset, duration, impairment, clinical history, physical health, and the presence of other symptoms all matter. A symptom questionnaire or self-report of distress is useful evidence that warrants attention; it does not automatically establish a psychiatric diagnosis or an individually provable cause.

Are emotional effects inevitable?

No single outcome occurs in every person. Wright and colleagues' 2023 longitudinal study interviewed 122 men in solitary confinement and 204 men in other prison settings in Arizona over three waves. Within-person worsening and between-group differences in distress were small, and the between-group relationship diminished after including individual characteristics and broader prison experiences. This result suggests heterogeneity and the importance of comparison conditions. It neither invalidates findings from other studies nor establishes that extended isolation is safe for all individuals.

Hallucinations, suspiciousness, and psychosis-like symptoms

Some studies report increases in unusual perceptual experiences, suspiciousness, or symptoms captured by psychotic-symptom scales. The 2020 meta-analysis found a standardized mean difference of 0.35 in psychotic symptom measures across available comparisons. Such scales do not determine by themselves whether a person has schizophrenia, another psychotic disorder, a sleep-related perceptual disturbance, or a transient stress reaction.

A careful assessment considers previous psychiatric history, sleep deprivation, medication interruptions, medical or neurological issues, acute stress, substance withdrawal, and the circumstances under which an unusual experience was reported. The clinical reality of the experience deserves attention without turning a symptom into a definitive diagnosis or making a legally consequential inference about criminal responsibility.

Sleep, concentration, and cognitive functioning

Restricted activity, unpredictable schedules, noise, lighting, limited daylight, fear, and reduced access to programs can interfere with sleep. Disturbed sleep may then affect concentration, emotional regulation, memory, and problem-solving. People exposed to isolation sometimes describe disorientation, difficulty tracking time, intrusive thoughts, or reduced ability to focus. These accounts are important for assessment, but evidence on enduring cognitive deficits is less developed than evidence about general psychological distress.

Potential pathways include an impoverished range of social and sensory experiences, limited cognitive stimulation, sustained vigilance, and disrupted circadian rhythms. The specific contribution of each pathway is not consistently measured in correctional studies. Research on voluntary solitude or experimental isolation outside prisons can illuminate possible mechanisms, but conditions are sufficiently different that results should not be transferred directly without qualification.

Self-harm and suicide: evidence with immediate clinical implications

Self-injurious behavior is among the most consequential outcomes studied in restrictive housing. In a 2020 systematic review and meta-analysis of self-harm risk factors in prison, Favril and colleagues analyzed 35 studies involving 663,735 incarcerated people. Solitary confinement was associated with self-harm, with a pooled odds ratio of approximately 5.6. Heterogeneity was exceptionally high, with I-squared around 98%, which means the pooled estimate conceals substantial differences between studies.

A 2014 study of New York City jail records by Kaba and colleagues also reported a strong association between solitary confinement and recorded self-harm after accounting for measured characteristics. Its observational design cannot resolve all the pathways linking disciplinary placement, psychiatric vulnerability, institutional behavior, and injury. Nonetheless, the combination of findings offers a strong reason to improve surveillance, prompt clinical responses, and alternatives to isolation.

Self-harm, suicide attempts, and suicide deaths are distinct outcomes

Self-harm can occur with or without suicidal intent. A suicide attempt requires suicidal intent, while death by suicide is a separate mortality outcome. These distinctions affect how incidents are recorded and how evidence should be summarized. The review of prison suicide-attempt risk factors identifies prison-environment exposures alongside prior ideation, previous self-harm, psychiatric morbidity, and social factors. No single correlate is enough to conclude that a particular individual will attempt suicide.

Does a large odds ratio predict what will happen to one person?

An odds ratio compares the odds of an outcome between groups in a study. It does not mean that an isolated individual faces a 5.6-fold certainty of self-harm, nor does it give an individual's absolute probability. Converting group evidence into a prediction requires an explicit population, a specified outcome and time horizon, calibrated probability estimates, validated thresholds, and evaluation of false-positive and false-negative rates. Solitary-confinement studies generally investigate associations rather than validate an individual risk score.

Clinical decisions should draw on current symptoms, reported thoughts, previous behavior, access to support, the immediate environment, and professional evaluation. A mental-health diagnosis is neither proof of misconduct nor a substitute for a safety assessment.

Why are people with existing mental-health conditions placed in isolation?

Mental illness and placement in isolation are associated in several studies, although they may be linked through multiple institutional processes. The 2020 review by Dellazizzo and colleagues, covering 11 studies and 163,414 people, reported a pooled odds ratio of approximately 1.62 for placement among incarcerated people with mental-health problems compared with those without.

The more narrowly focused 2025 disciplinary-confinement meta-analysis pooled five studies with 27,455 individuals and found an odds ratio of 1.23, with a 95% confidence interval from 1.10 to 1.38, for placement among people identified as having a mental disorder. These values measure different institutional exposures, so they should not be combined into one supposedly universal estimate.

The possibility of a reinforcing cycle

Symptoms may contribute to behavior that staff interpret as a disciplinary problem. Institutional practices may influence which behavior is observed, reported, and sanctioned. Isolation may then increase distress and reduce access to stabilizing relationships or treatment. These steps can interact, although the evidence in any particular case must establish timing and account for other explanations. The possibility that people enter segregation with higher levels of need makes preventive care and careful causal analysis especially important.

Diagnosis and criminal behavior remain separate questions

A psychiatric disorder is a clinical finding, an institutional rule violation is a disciplinary allegation or finding, and criminal responsibility is determined under a legal standard. They cannot be substituted for one another. Correctional decisions should evaluate an individual's actual behavior, circumstances, vulnerabilities, and applicable procedural safeguards. Research on the experience of isolation does not classify people with mental illness as dangerous or criminal.

Psychological mechanisms: how isolation may influence well-being

Meaningful social interaction contributes to emotional regulation, orientation, shared routines, and opportunities to correct misunderstandings. Severe restriction can remove multiple ordinary supports at once. A 2024 systematic review of social contacts and prisoners' mental health found that stronger social support was generally associated with fewer common mental-health symptoms, although much of the underlying evidence was cross-sectional.

Several plausible processes may work together: persistent loneliness, loss of control, sustained threat monitoring, reduced social feedback, disruption of sleep, limited movement, reduced educational and therapeutic engagement, and difficulty maintaining a normal sense of time. The relative contribution of these pathways has not been established uniformly in controlled studies. It is therefore more accurate to treat them as overlapping mechanisms that deserve direct measurement than as a single proven biological pathway.

Predictability, autonomy, and perceived threat

A person uncertain about when a placement will end, what behavior will change it, or whether allegations can be challenged may experience persistent stress. The surrounding environment also matters: officer interactions, safety from violence, clarity of rules, opportunity to speak privately with clinicians, access to family contact, and confidence that complaints will be heard can shape the experience. These are plausible modifying conditions, rather than variables that every published study has tested causally.

Social deprivation and sensory restriction are not identical

A cell can be quiet and visually monotonous while offering some regular communication, or relatively stimulating while providing little reciprocal human contact. An effective study separates time in a cell from actual social interaction, activity, and stimulation. This distinction helps explain why changing one housing practice may produce different outcomes across institutions.

Duration, cumulative exposure, and the 15-day threshold

The Mandela Rules' definition of prolonged solitary confinement begins after 15 consecutive days. This is a human-rights standard and policy boundary, not a finding from a clinical experiment establishing that 15 days is medically safe. Psychological distress can occur earlier, and outcomes may reflect accumulated exposure, repeated placements, uninterrupted duration, and individual vulnerability. The UN's official standards should be read alongside empirical evidence without confusing their different functions.

An accurate exposure history should document the dates of each placement, the number of hours confined, interruptions, actual social contact, access to services, prior symptoms, and changes over time. Studies that record only whether a person has ever experienced segregation obscure distinctions between a brief episode and repeated months of near-total isolation.

Can psychological effects persist after release from isolation?

Some research has connected prior restrictive housing with adverse outcomes after prison release. In a large North Carolina cohort study, Brinkley-Rubinstein and colleagues followed 229,274 people released from prison. Any restrictive-housing exposure was associated with higher mortality in the first year after release, including an adjusted hazard ratio of 1.24 for all-cause death and 1.78 for suicide death.

A hazard ratio represents a relative rate over follow-up under a particular analytic model. It is not the proportion who died, an individual's personal probability, or proof that isolation caused a particular death. Previous health problems, circumstances of release, substance-use history, and institutional experiences can affect the association. The 2020 systematic review similarly found mortality signals but emphasized uncertainty in post-release causal inference.

A later North Carolina analysis of in-custody mortality contributes additional evidence, but differences in populations and outcome definitions limit direct comparison. Psychological recovery also varies; some people may improve after transfer to less restrictive housing, while others may need continued treatment and social support. There is no defensible universal timetable for recovery or inevitable permanence.

Why researchers disagree about effect sizes

Observational comparisons face selection into restrictive housing. The people assigned to segregation may differ from comparison groups in previous mental-health history, self-harm, victimization, institutional misconduct, substance use, and access to care. Researchers can statistically control measured differences, yet records often lack detailed information about prior symptoms, environmental changes, and the reasons behind placement. Reverse causation is possible when deteriorating symptoms contribute to isolation, which in turn may aggravate the symptoms.

Longitudinal studies improve inference by measuring change within individuals, but they still depend on attrition, accurate exposure history, and appropriately chosen comparison groups. Wright et al. (2023) demonstrate why studying broader prison conditions matters; Luigi et al. (2020) demonstrate why pooled symptom differences remain important. They answer overlapping but not identical questions.

Laboratory findings, clinical reports, and administrative records

A prison symptom survey measures reported or recorded experiences. A clinical examination may support a diagnosis. A hospital record shows service use in a particular system. An administrative incident register reflects institutional reporting practices. A study of release mortality tracks a distinct outcome after custody. These sources are complementary, yet they should not be presented as interchangeable proof of a single causal process.

How should new studies improve the evidence?

Better studies would compare clearly defined housing conditions, obtain mental-health measurements before placement, document cumulative duration and actual human contact, measure treatment access, follow people through housing changes and release, and assess outcomes among populations often omitted from research. Policy reforms can sometimes create opportunities to study change without deliberately assigning people to potentially harmful conditions. Transparent reporting of missing data and sensitivity analyses is essential.

Who may be especially vulnerable?

People with severe current symptoms, prior suicide attempts, developmental disabilities, cognitive limitations, physical disability, significant trauma exposure, or interrupted treatment may face particular difficulties in restrictive conditions. These factors should guide individualized evaluation and accommodations. They do not prove that any one person will deteriorate or that having a diagnosis makes a person violent. The NCCHC position statement recommends excluding juveniles, individuals with mental illness, and pregnant women from solitary confinement of any duration.

Young people and developmental differences

Adolescents have different developmental and educational needs, social dependencies, and legal protections from adults. The NCCHC's 2024 guidance for adolescents in adult correctional facilities supports reducing or eliminating restrictive housing and providing age-appropriate services. Research conducted primarily among adult male prisoners should not automatically be generalized to detained adolescents.

Race, disability, and institutional fairness

Placement patterns may vary across racial, disability, and other demographic groups, and the grounds for such variation require careful investigation. A 2024 US Government Accountability Office report documented weaknesses in the federal restrictive-housing system and called for stronger attention to disparities and implementation. Fairness requires attention to the criteria by which placement decisions are made, the opportunities to challenge them, access to health care, and whether conditions differ for comparable individuals.

Protective custody and people facing threats

A serious threat can make immediate separation necessary, but protective placement should not automatically mean prolonged deprivation of social contact, exercise, programs, or health care. Staff should assess the actual threat and seek safe, less restrictive options. The Department of Justice's restrictive-housing review encourages alternatives when people need separation for their protection.

International standards and United States law

Under Rules 43–45 of the Nelson Mandela Rules, indefinite and prolonged solitary confinement are prohibited, and any use of solitary confinement is framed as an exceptional last resort for the shortest possible time, with appropriate review. These standards are influential in professional guidance and human-rights evaluation. They do not, merely by existing, define every criminal, constitutional, or administrative obligation in the United States. The UN resolution is the authoritative text.

In the United States, constitutional, statutory, disability, detention, and correctional-policy questions depend on jurisdiction, custody status, conditions of confinement, institutional knowledge, and the governing legal test. Rules for pretrial detainees and sentenced prisoners may differ. A psychological finding about elevated group-level symptoms can inform a factual record, but whether a particular placement violates a legal standard is determined through law and evidence specific to the case.

US federal oversight and correctional policy

The Justice Department's 2016 report recommended clearly articulated placement reasons, objective evidence, regular multidisciplinary review, limited duration, and pathways back to less restrictive housing. The GAO's 2024 audit found that many prior reform recommendations had not been fully implemented and identified weaknesses in federal oversight. Such findings describe specific periods and systems and must not be treated as current statistics for every jail or prison.

Correctional mental-health assessment and treatment

A clinically sound assessment documents current symptoms, recent changes, preexisting diagnoses where established, medications, sleep, medical needs, trauma-related concerns, substance-related factors, self-harm history, and current safety needs. It should also document the actual environment: time out of cell, meaningful interaction, exercise, light, opportunities for activity, perceived threats, and access to loved ones. Observations by staff, self-report, medical records, and clinical examination provide different types of evidence.

Screening may identify a need for further assessment. A psychometric score quantifies performance or symptom responses under the conditions of a particular instrument. A diagnosis is a clinical judgment based on established criteria and suitable evaluation. A professional forensic opinion addresses a defined referral question; a legal finding applies a legal rule. These distinctions are especially important when mental-health documents are used in disciplinary hearings, litigation, or institutional housing decisions.

Health care, monitoring, and confidentiality

According to the NCCHC position statement, health staff should assess a person upon placement and subsequently at least daily, provide prompt assistance, advocate for removal when health deteriorates or care cannot be provided, and protect clinical independence and confidentiality. A quick encounter through a door may be inadequate for evaluating complex mental-health concerns. Privacy, appropriate interpretation, continuity of medication, and accessible reporting routes are part of meaningful care.

What happens when there is immediate suicide risk?

When a person expresses suicidal intent, has engaged in serious self-injury, or shows an acute mental-health crisis, correctional staff should activate an immediate in-person clinical and safety response. Conditions should support observation, humane care, necessary emergency treatment, and a suitable clinical environment. Research averages and aggregate effect sizes do not replace direct assessment of an urgent individual situation.

Alternatives, reforms, and outcomes worth measuring

Reducing reliance on restrictive housing can involve earlier conflict intervention, safer protective housing, structured behavioral supports, appropriately staffed clinical units, access to programs, and prompt independent review. The appropriate alternative depends on the immediate safety problem and institutional capacity. A program's success should be evaluated through actual conditions and outcomes rather than the name assigned to its housing unit.

Meaningful evaluation measures time out of cell, social interaction, repeated and cumulative exposure, access to care, self-harm, suicide attempts, staff and resident safety, disciplinary outcomes, use of force, and fairness across groups. Pre-post reforms and natural experiments can shed light on practical outcomes if they account for background changes and selection. The DOJ policy recommendations and NCCHC guidance supply operational principles for such work.

Does solitary confinement improve prison safety?

An institution may sometimes need immediate separation to prevent injury. Whether an extended solitary-housing strategy is the most effective response is a separate empirical question requiring comparison with feasible alternatives and measurement of safety for residents and employees. Mental-health research alone cannot establish the best arrangement for every emergency; an assertion of necessity should likewise be documented and independently reviewed.

Does solitary confinement reduce recidivism?

Reoffending after release is distinct from mental-health symptoms experienced during custody. A systematic review of solitary confinement and recidivism addresses this separate correctional outcome, but its evidence should not be used to turn symptom findings into criminal-risk predictions. Rehabilitation effectiveness, desistance, and recidivism belong to related investigations with their own operational definitions and longitudinal methods.

Common myths and misleading claims

The first myth is that every person in solitary confinement permanently develops a psychiatric disorder. Existing research demonstrates variable responses and does not justify a universal diagnosis or a uniform recovery forecast. The second myth is that a study reporting a modest average difference establishes safety. It may instead reflect the population, duration, comparison conditions, measurement choice, or limited statistical power. The third myth is that segregation necessarily identifies a violent or criminally dangerous person. Protective and administrative placements occur for reasons unrelated to established dangerousness.

Another misunderstanding treats the Mandela Rules' 15-day threshold as proof that shorter periods have no psychological consequences. It is a human-rights boundary, and symptoms require attention whenever they arise. Finally, the presence of a mental-health diagnosis does not establish wrongdoing, and an elevated psychological-risk factor is neither a legal finding nor an individual behavioral prediction.

Frequently asked questions

Can solitary confinement cause depression and anxiety?

The evidence links isolation with elevated mood symptoms and general distress in several correctional populations. Isolation may contribute to deterioration, but identifying the cause of a particular clinical disorder requires a thorough evaluation that accounts for prior symptoms and other prison conditions. Systematic review.

Can solitary confinement cause hallucinations?

Psychosis-like symptoms and unusual perceptual experiences appear in some studies. These require clinical assessment of the immediate environment, sleep, medical issues, medication exposure, previous symptoms, and other causes. A reported experience does not alone establish a psychotic disorder or its cause. Review evidence.

Is solitary confinement associated with suicide?

Evidence links confinement to self-harm and, in some observational cohorts, suicide-related mortality outcomes after release. These findings warrant prevention and timely clinical attention while leaving the cause and probability in an individual case to appropriate investigation. Review of self-harm and post-release cohort.

How long does it take for effects to appear?

The evidence does not establish a universally safe duration or a precise onset time for everyone. Reactions can differ with prior health, actual social deprivation, institutional conditions, and repeated exposure. The international standard calls confinement prolonged after more than 15 consecutive days; it is not a clinical guarantee for shorter exposure. UN Mandela Rules.

Are the psychological effects permanent?

Some individuals improve when conditions change, while others report prolonged difficulties or have ongoing treatment needs. The research cannot establish a universal trajectory and is limited in distinguishing exposure effects from prior and concurrent circumstances. Review.

Can someone be in solitary confinement for their own protection?

Yes, some institutions use highly restrictive protective housing. The mental-health consequences depend on conditions, and professional guidance favors the least restrictive safe alternative with meaningful contact and appropriate care. DOJ guidance.

Is solitary confinement illegal in the United States?

The applicable rule depends on the jurisdiction, whether a person is awaiting trial or serving a sentence, the conditions and duration, and specific legal requirements. International standards and domestic legal findings must be distinguished. US Department of Justice review.

What should family members or advocates document?

Useful information includes dates of placement, the amount of meaningful contact and activity available, clinical symptoms and requests for care, any urgent safety concerns, communications with staff, and the institution's review or appeal procedures. Medical questions call for qualified clinicians, while particular legal challenges require jurisdiction-specific advice. Claims about the cause of harm should be grounded in documented timing and clinical evidence.

Conclusion

Solitary confinement is associated with important mental-health risks, particularly psychological distress, self-harm, and some mortality-related outcomes. Evidence from systematic reviews, cohort studies, and professional guidance supports prevention and careful clinical safeguards. At the same time, observational selection, diverse institutional conditions, and mixed longitudinal findings limit simple causal formulas and universal predictions.

Correctional decisions should document why restriction is used, what safer options are available, how long the restriction lasts, and whether a person receives adequate health care and meaningful human contact. Clinical observations, psychometric results, institutional judgments, and legal findings must each remain within their appropriate evidentiary boundaries. A scientifically grounded policy evaluates both health and safety, protects people with heightened needs, and seeks the least restrictive feasible response.