Mental health courts have been studied more rigorously than almost any other criminal justice diversion intervention. The evidence is not ambiguous.
A RAND Corporation meta-analysis of 45 studies found that mental health court participation reduced arrest rates by 20 percent and incarceration days by 40 percent compared to traditional prosecution. The Council of State Governments Justice Center reviewed the evidence base separately and reached similar conclusions. The SAMHSA-funded MacArthur Foundation study, which followed participants across four jurisdictions for two years, found that 73 percent of graduates had no new criminal charges within the follow-up period.
These are not small effects. For context, standard probation produces recidivism rates of 35 to 50 percent over three years. Incarceration, unsurprisingly, produces even worse long-term outcomes for people with serious mental illness, partly because the conditions of detention worsen psychiatric symptoms and disrupt whatever treatment relationships existed before arrest.
Mental health courts work through a mechanism that is not complicated: they connect people to treatment. The courts provide intensive supervision, frequent check-ins, and coordinated access to housing, medication, and case management. Participation is voluntary. Defendants opt in and can opt out, facing traditional prosecution if they do. The ones who stay tend to fare well, in part because the court creates accountability structures that keep them engaged with treatment over months rather than days.
The fiscal case is as strong as the clinical one. A 2010 analysis published in Psychiatric Services found that mental health court participation produced net cost savings of approximately $5,000 per participant over two years after accounting for treatment costs, compared to traditional prosecution of the same population. More recent analyses in California and Ohio have found similar or larger savings.
Despite this evidence, mental health courts serve a small fraction of the population that could benefit from them. There are roughly 400 mental health courts operating in the United States, compared to over 3,000 counties. In most jurisdictions, a defendant with a serious mental illness who is arrested for a nonviolent offense will be processed through standard courts with no systematic effort to connect them to treatment. The psychiatrist who testified at their arraignment has never met them. The probation officer who supervises their release has a caseload of 200.
The gap between what mental health courts achieve and how widely they are deployed is a policy failure, not a knowledge failure. We know this works. The decision not to scale it is a choice, made year after year in legislative budget processes where treatment programs compete against prison construction and lose.
The political path to expansion is clearer than it has ever been. Both fiscal conservatives and public health advocates find common ground on mental health diversion. The argument for scaling these courts does not require anyone to change their ideological priors. It just requires taking the evidence seriously.