Brown v. Plata
The Supreme Court upheld a federal three-judge court's order requiring California to reduce its prison population to 137.5% of design capacity, finding that severe overcrowding was the primary cause of unconstitutional medical and mental health care for prisoners.
The ruling lets stand what may require releasing tens of thousands of prisoners over time, and it affirms that federal courts can order population caps as a last-resort remedy when overcrowding itself is blocking any fix for ongoing Eighth Amendment violations.
How it got here: After years of failed remedial orders in both cases, the presiding judges convened a special three-judge court under federal law, which ordered a population cap; California appealed directly to the Supreme Court.
The Case in Depth
What happened
California's prisons, built for about 80,000 people, held nearly double that at the time of trial. Two long-running class actions—one on behalf of prisoners with serious mental illness, another on behalf of prisoners with serious medical conditions—documented years of inadequate care, including preventable deaths, prolonged waits for treatment, and prisoners held in makeshift cages awaiting psychiatric beds.
The question before the Court
Could a federal court order California to shrink its severely overcrowded prison population to fix years of unconstitutional medical and mental health care for inmates?
The Court's answer
Yes — the Court ruled that federal courts could order California to cap its prison population, because overcrowding was the main reason the state's prisons could not deliver even minimally adequate medical and mental health care, in violation of the Eighth Amendment. Years of piecemeal remedies — special masters, a receiver, consent decrees — had failed, and the evidence showed there was no realistic way to fix the underlying care crisis without shrinking the number of people in the prisons.
The Court found the specific order — a cap at 137.5% of design capacity within two years — was not clearly wrong, since it fell between the numbers different experts had proposed, and it gave the state broad discretion in how to meet the cap (construction, transfers, parole reform, or release) rather than dictating exactly who must go free. The lower court also adequately weighed public-safety concerns, relying on evidence that similar population reductions elsewhere had not increased crime.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
California had to follow through on plans to shrink its prison population by tens of thousands of people, reshaping parole, sentencing, and county-jail policy. The decision also gives other states and federal courts a roadmap for when overcrowding-driven population caps are a permissible last resort under the Prison Litigation Reform Act.
What changes now
The three-judge court's order stands, but it remains open to modification — California can ask to extend the two-year deadline or adjust terms as it makes progress or as conditions change. The state must proceed with population-reduction measures already underway, such as shifting inmates to county jails, while the three-judge court continues to monitor compliance and public-safety effects going forward.
What this does not decide
The Court did not order the release of any specific prisoners itself; it left the method of reducing overcrowding — new construction, transfers, parole reform, or release — to California's discretion, and it left the three-judge court free to modify the deadline or terms based on later developments.
Concurrences and dissents
Dissent — Justice Scalia
Justice Scalia argued the entire theory of the case was flawed because the Eighth Amendment protects individual prisoners who are actually denied care, not an entire class based on a 'systemwide' deficiency, and that a structural injunction ordering mass release goes far beyond what the PLRA's narrow-tailoring requirements allow. He also criticized the majority's remand instructions as an improper, legally unmoored 'warning shot' to the lower court.
Dissent — Justice Alito
Justice Alito argued the three-judge court relied on outdated evidence and refused to consider recent improvements, that it failed to show no remedy short of mass release could work, and that it gave inadequate weight to public safety given the historical risks of prisoner-release programs like Philadelphia's in the 1990s. He would have reversed and required a more targeted remedy limited to the plaintiff classes.
How the Court got there
The legal reasoning, step by step
- The Court explained that under the Prison Litigation Reform Act (PLRA), only a specially convened three-judge court can order a prison population limit, and only after a prior, less drastic order has failed and the state had reasonable time to comply — conditions the Court found satisfied given 12 years of effort in one case and 5 in the other.
- The three-judge court then had to find by clear and convincing evidence that crowding was the 'primary cause' of the constitutional violation. The Court read 'primary cause' to mean the foremost or chief cause, not the sole cause, so the finding could stand even though other factors, like budget shortfalls, also contributed.
- The Court reviewed the trial record — including staff vacancy rates as high as 54% for psychiatrists, months-long waits for care, and expert testimony — and concluded the three-judge court did not clearly err in finding overcrowding was this foremost cause, deferring heavily to the trial court's fact-finding role.
- Applying the requirement that 'no other relief' would fix the violation, the Court agreed that alternatives like new construction, out-of-state transfers, or added staffing were not realistic given California's fiscal problems and chronic understaffing, so a population limit was necessary.
- The Court then addressed narrow tailoring, the requirement that a remedy fit only what is needed to fix the violation: it held that a systemwide population cap could be narrowly tailored even though it would affect prisoners outside the plaintiff classes, because the medical care system operated systemwide and all prisoners were at risk of becoming class members.
- Finally, the Court held that the three-judge court gave the required 'substantial weight' to public safety by considering statistical evidence from other jurisdictions and by leaving the State discretion over which specific methods to use to reduce crowding, rather than requiring proof of zero possible risk.
Doctrinal impact
Cases affected by this decision
Distinguishes Lewis v. Casey (518 U. S. 343)
The majority distinguished this case from precedent barring courts from reaching beyond the actual scope of a constitutional violation.