Mental Health and the Criminal Justice System: Diversion and Treatment

The intersection of mental health and the criminal justice system represents one of the most structurally complex challenges in US public policy, affecting an estimated 2 million bookings annually involving individuals with serious mental illness (Treatment Advocacy Center, 2016 report). Diversion programs redirect people with mental health conditions away from prosecution and incarceration toward clinical treatment, operating at multiple points in the justice process from pre-arrest through post-conviction. This page covers the definitional framework, program mechanics, causal drivers, classification criteria, and contested tradeoffs that characterize this field. Understanding these structures is essential for interpreting how mental health law, criminal procedure, and behavioral health systems interact.

• Definition and scope
• Core mechanics or structure
• Causal relationships or drivers
• Classification boundaries
• Tradeoffs and tensions
• Common misconceptions
• Checklist or steps (non-advisory)
• Reference table or matrix
• References

Definition and scope

Mental health diversion refers to a set of legally authorized mechanisms by which individuals with diagnosed mental health conditions—or those suspected of having them—are redirected from standard criminal prosecution into treatment-based alternatives. The American Bar Association defines diversion broadly as any formal or informal process that suspends, defers, or terminates prosecution in exchange for participation in a non-criminal intervention (ABA Criminal Justice Standards).

The scope of mental health diversion in the US spans pre-arrest diversion (police-based intervention before any charge is filed), pre-booking diversion (deflection at the point of jail entry), pre-trial diversion (post-charge but before adjudication), and post-adjudication diversion (alternatives to sentencing after a finding of guilt). Mental health courts, crisis intervention teams (CIT), competency restoration programs, and conditional release arrangements all fall within this scope.

The Substance Abuse and Mental Health Services Administration (SAMHSA) identifies co-occurring substance use disorders as present in a significant portion of justice-involved individuals with mental illness, which directly shapes how diversion eligibility and treatment planning are structured (SAMHSA's Criminal and Juvenile Justice page). For reference context on overlapping diagnoses, see Substance Use Disorders and Co-Occurring Mental Health.

Core mechanics or structure

Diversion programs operate through a structured sequence that bridges the legal and clinical systems. The mechanics vary by diversion point but share common procedural architecture:

Pre-Arrest and Crisis Intervention Team (CIT) Model
Developed in Memphis, Tennessee in 1988, the CIT model trains law enforcement officers—typically in a 40-hour curriculum endorsed by the National Alliance on Mental Illness (NAMI)—to de-escalate psychiatric crises and connect individuals to emergency mental health services rather than making arrests (NAMI CIT Resource Center). Officers use clinical referral pathways to psychiatric emergency services or crisis stabilization units.

Mental Health Courts
Mental health courts are problem-solving courts operating under state statute in all 50 states. As of the most recent Council of State Governments Justice Center count, more than 450 mental health courts operate nationally (CSG Justice Center). Participants enter voluntary agreements to comply with individualized treatment plans, appear for status hearings, and meet supervision requirements. Successful completion typically results in charge dismissal or reduced sentencing. The Bureau of Justice Assistance (BJA) funds and provides technical assistance to many of these courts through the Justice and Mental Health Collaboration Program (JMHCP), authorized under the Mentally Ill Offender Treatment and Crime Reduction Act (MIOTCRA), 34 U.S.C. § 10651.

Competency Restoration
Under Dusky v. United States, 362 U.S. 402 (1960), a defendant must have sufficient present ability to consult with an attorney and understand the proceedings before trial can proceed. When competency is in question, courts order forensic evaluation; if found incompetent, defendants are diverted to competency restoration programs—often inpatient—before the case proceeds. This process intersects directly with Inpatient Psychiatric Care Explained and Forensic Psychiatry Reference.

Conditional Release and Assisted Outpatient Treatment (AOT)
Post-adjudication, conditional release programs impose mental health treatment compliance as a condition of probation or parole. Separate from criminal justice, Assisted Outpatient Treatment (AOT) laws—enacted in 47 states as of the Treatment Advocacy Center's legislative tracking—allow civil courts to order outpatient treatment for individuals who meet specific risk criteria without requiring a criminal charge (Treatment Advocacy Center, AOT Laws).

Causal relationships or drivers

Several structural factors drive elevated mental health need within justice-involved populations:

Deinstitutionalization: The systematic closure of state psychiatric hospitals beginning in the 1960s under the Community Mental Health Act of 1963 reduced state psychiatric bed capacity by approximately 96% over five decades, from roughly 560,000 beds in 1955 to under 38,000 by 2016 (Treatment Advocacy Center, "Emptying the 'New Asylums'"). Community mental health infrastructure did not scale proportionately to absorb this population.

Criminalization of mental illness: Research published by the National Institute of Justice documents that jails have become de facto psychiatric facilities in many jurisdictions, with rates of serious mental illness among jail populations estimated at 14.5% for men and 31% for women (Steadman et al., Psychiatric Services, 2009, cited by NIJ).

Poverty and social determinants: Housing instability, unemployment, and lack of health insurance concentrate individuals with untreated mental illness in environments with elevated law enforcement contact. The interaction between Racial and Ethnic Disparities in Mental Health and justice system overrepresentation is documented extensively in the literature.

Fragmented service systems: The separation between behavioral health, housing, social services, and criminal justice agencies creates gaps that increase recidivism risk.

Classification boundaries

Diversion programs are classified along two primary axes: point of intervention and legal status of the participant.

A secondary classification distinction exists between specialty court models (mental health courts, drug courts with mental health tracks) and systemic deflection models (CIT, co-responder programs, 988 Lifeline mobile crisis). Specialty courts involve ongoing judicial oversight; deflection models route individuals to community care without formal court involvement.

Involuntary Psychiatric Holds in the US represents a parallel civil mechanism that may intersect with or substitute for criminal diversion in acute crisis scenarios.

Tradeoffs and tensions

Voluntariness vs. coercion: Mental health court participation is nominally voluntary, but defendants facing incarceration have limited realistic freedom of choice. Civil liberties organizations, including the American Civil Liberties Union (ACLU), have documented concerns that defendants may plead guilty to access diversion, thereby acquiring a criminal record that would not otherwise exist.

Net-widening: Research from the Council of State Governments Justice Center identifies the risk that mental health courts may draw into the criminal justice system individuals whose charges—absent the court—would have been dismissed outright, expanding rather than contracting justice involvement.

Treatment capacity constraints: Diversion is structurally dependent on the availability of community mental health services. Where outpatient mental health services and crisis stabilization capacity are insufficient, diversion orders cannot be fulfilled. This creates pressure on Community Mental Health Centers and Partial Hospitalization and Intensive Outpatient Programs to absorb court-ordered referrals.

Recidivism evidence: Meta-analyses reviewed by the National Institute of Justice show generally favorable recidivism outcomes for mental health court participants compared to traditional prosecution, but effect sizes vary substantially by program design, jurisdiction, and population served. Outcomes are not uniform.

Privacy and disclosure: Court-ordered treatment requires coordination between clinical providers and the court, raising structured tensions under HIPAA (45 CFR Parts 160 and 164) and 42 CFR Part 2 (substance use treatment records). See HIPAA and Mental Health Records for framework detail.

Common misconceptions

Misconception: Mental health diversion applies only to minor offenses.
Correction: While most programs prioritize nonviolent misdemeanors, post-adjudication programs and some mental health courts do accept felony charges, including violent offenses, where clinical and risk factors support it. Eligibility criteria are set by individual court orders and program design, not by a uniform federal standard.

Misconception: A finding of incompetency is equivalent to an insanity defense.
Correction: Incompetency to stand trial (governed by Dusky) addresses present-state capacity to participate in proceedings. The insanity defense (governed by the Model Penal Code or the M'Naghten standard depending on jurisdiction) addresses mental state at the time of the offense. These are legally distinct determinations with different procedural consequences.

Misconception: Mental health courts guarantee treatment instead of incarceration.
Correction: Non-compliance with mental health court requirements—missed appointments, positive drug screens, treatment refusal—can and does result in incarceration. The treatment pathway is conditional, not unconditional.

Misconception: Diversion eliminates the criminal record.
Correction: The record impact of diversion varies by jurisdiction, diversion type, and completion status. Pre-arrest deflection may leave no record; post-adjudication diversion after a guilty plea creates a conviction record unless formally expunged under applicable state law.

Misconception: All individuals with mental illness in the criminal justice system are violent.
Correction: Research from SAMHSA and the Bureau of Justice Statistics consistently shows that individuals with mental illness are more likely to be victims of crime than perpetrators of violent crime. Overrepresentation in the justice system reflects poverty, housing instability, and system failure—not inherent violence risk (BJS, "Mental Health Problems of Prison and Jail Inmates").

Checklist or steps (non-advisory)

The following sequence describes the procedural stages typically documented in mental health diversion literature. This is a descriptive framework, not legal or clinical guidance.

Stages of Mental Health Court Processing (Illustrative)

1. Referral identification — Law enforcement, defense counsel, prosecutor, or court identifies potential mental health involvement at arrest or arraignment.
2. Screening — A standardized screening instrument (e.g., the Brief Jail Mental Health Screen, developed with SAMHSA support) is administered to flag potential mental disorder.
3. Clinical assessment — A qualified mental health professional conducts a clinical evaluation to establish diagnosis, treatment history, and risk factors.
4. Eligibility determination — The court, prosecution, and defense review clinical findings against the program's eligibility criteria (charge type, diagnosis category, prior justice history).
5. Informed consent — The defendant receives disclosure of program requirements, potential consequences of non-compliance, and privacy limitations before agreeing to participate.
6. Treatment plan development — A licensed clinician and case manager develop an individualized treatment plan addressing mental health, substance use (if co-occurring), housing, and medication compliance.
7. Judicial status hearings — Regular court appearances (commonly every 2–4 weeks initially) allow the judge to review compliance, adjust conditions, and provide structured accountability.
8. Phase progression — Programs structured in phases reduce supervision intensity as compliance is demonstrated over defined time periods.
9. Graduation or termination — Successful completion triggers charge dismissal, sentence reduction, or other agreed disposition. Non-completion results in return to standard prosecution track.
10. Reentry planning — Transition planning links participants to community-based services prior to program exit to reduce recidivism risk.

Reference table or matrix

Diversion Program Models: Comparative Overview

References

• Substance Abuse and Mental Health Services Administration (SAMHSA) — Criminal and Juvenile Justice
• Bureau of Justice Assistance — Justice and Mental Health Collaboration Program
• Council of State Governments Justice Center — Mental Health Courts
• Treatment Advocacy Center — Fixing the Crisis (Diversion and AOT)
• Treatment Advocacy Center — Assisted Outpatient Treatment Laws by State
• Treatment Advocacy Center — "Emptying the 'New Asylums'" (2017)
• National Alliance on Mental Illness (NAMI) — Crisis Intervention Team Programs
• Bureau of Justice Statistics — Mental Health Problems of Prison and Jail Inmates
• National Institute of Justice — Mental Illness in the Criminal Justice System
• American Bar Association — Criminal Justice Standards (Diversion)
• Mentally Ill Offender Treatment and Crime Reduction Act — 34 U.S.C. § 10651 (via GovInfo)
• [Second Chance Act — 34 U.S.C. § 60501 (via GovInfo)](