Mental Health and the Criminal Justice System: Diversion and Treatment

When someone in psychiatric crisis ends up in handcuffs instead of a hospital, the system has already made a choice — one with consequences that ripple for years. Mental health diversion programs are structured legal and clinical pathways that redirect people with mental illness away from prosecution and incarceration toward supervised treatment. This page covers how those programs are defined, how they operate at each stage of the criminal process, the conditions they typically address, and the legal and clinical factors that determine who qualifies.

Definition and scope

Diversion, in a criminal justice context, means interrupting the default path of arrest → prosecution → conviction → incarceration and substituting a treatment-based alternative at some defined point in that sequence. The interruption can happen early — before charges are filed — or late, after conviction and sentencing.

The scale of the need is not abstract. The Bureau of Justice Statistics has documented that more than 44 percent of people held in state and federal prisons report a history of mental illness, a figure that reflects decades of policy decisions that directed crisis intervention and emergency mental health resources away from community settings. The Treatment Advocacy Center has noted that the three largest de facto psychiatric facilities in the United States are the Los Angeles County Jail, Rikers Island, and the Cook County Jail — not hospitals.

Diversion programs exist at the federal level and across all 50 states, though the structure, eligibility criteria, and funding vary significantly by jurisdiction. The Substance Abuse and Mental Health Services Administration (SAMHSA) maintains a framework for evaluating these programs under its GAINS Center initiative, which has catalogued over 400 diversion programs operating across the country.

How it works

Diversion operates at three distinct intercept points, a model formalized by SAMHSA and the Policy Research Associates as the Sequential Intercept Model (SIM):

1. Pre-arrest diversion — Law enforcement officers, often trained in Crisis Intervention Team (CIT) protocols, redirect individuals to emergency psychiatric evaluation rather than booking. CIT programs, modeled after the original Memphis model developed in 1988, train officers in de-escalation and mental health recognition over a standard 40-hour curriculum.

2. Pre-trial diversion — After arrest but before trial, prosecutors or courts can offer diversion agreements. A defendant agrees to enter a treatment program; successful completion results in charges being dismissed or reduced. Mental health courts operate primarily at this intercept point.

3. Post-adjudication diversion — After a conviction, courts may suspend or reduce sentences contingent on treatment compliance. This is less common and involves more complex supervision arrangements.

Mental health courts — a specific institutional form — began with the Broward County Mental Health Court in Florida in 1997. There are now more than 400 operating in the United States, according to the Council of State Governments Justice Center. Participants typically have regular court appearances, submit to case management, and agree to medication compliance or therapy. Psychotherapy types and approaches commonly integrated into these programs include cognitive-behavioral therapy and supported employment models.

Common scenarios

The populations who cycle through these programs tend to cluster around a recognizable set of conditions. Schizophrenia and psychotic disorders account for a significant portion of mental health court participants, largely because untreated psychosis generates the kinds of behaviors — erratic public conduct, trespassing, minor altercations — that produce misdemeanor charges. Bipolar disorder appears frequently, particularly in cases involving manic episodes. PTSD and trauma-related disorders are disproportionately represented among veterans in the justice system, which is why the U.S. Department of Veterans Affairs co-administers specialized Veterans Treatment Courts in jurisdictions across the country.

Addiction and co-occurring disorders complicate almost every diversion case. Studies reviewed by SAMHSA estimate that between 60 and 80 percent of individuals in mental health courts also have a substance use disorder. Programs that treat only the psychiatric diagnosis while ignoring substance use tend to produce higher recidivism rates; integrated dual-diagnosis treatment is now considered a best-practice standard rather than an optional add-on.

Decision boundaries

Not every person with a mental health diagnosis qualifies for diversion, and the criteria that govern eligibility reflect genuine tensions between public safety, clinical feasibility, and resource capacity.

Factors that typically support diversion:
- Nonviolent or low-level charge
- Diagnosable mental disorder that is treatable in the community
- No prior history of program failure or absconding
- Identifiable housing or willingness to accept supervised housing
- Voluntary consent to treatment (in most pre-trial models)

Factors that typically work against diversion:
- Charges involving serious violence or sexual offenses
- Active psychosis so severe it impairs the ability to participate meaningfully in a program
- Prior diversion failures in the same jurisdiction
- Lack of available treatment slots — a structural constraint that frequently overrides clinical eligibility

The distinction between pre-trial and post-adjudication diversion matters significantly for rights. Pre-trial diversion in most jurisdictions does not require a guilty plea, which means a defendant who completes the program exits without a conviction record. Post-adjudication diversion, by contrast, typically follows a conviction or plea, and the treatment condition is attached to probation or a suspended sentence. That difference has lasting consequences for housing, employment, and mental health disability rights.

Competency is a separate but overlapping question. Courts cannot legally try a defendant who lacks the mental competency to understand the proceedings against them (a standard established in Dusky v. United States, 362 U.S. 402 (1960)). Individuals found incompetent are typically remanded for competency restoration — a process that often involves medication for mental health in an inpatient or outpatient setting — before the diversion question even arises.

The gap between who theoretically qualifies and who actually receives diversion often comes down to a single variable: whether the jurisdiction has invested in the infrastructure to make it real.