Whether the Fourteenth Amendment permits a State to continue confining a mentally ill person who is dangerous to no one and can survive safely in freedom, alone or with willing assistance from family or friends.
Holding
No. A State may not constitutionally confine such a person without more.
Reasoning
The jury found, on substantial evidence, that Donaldson was not dangerous to himself or to others and that, if he was mentally ill, he received no treatment. The Court treated those findings as establishing the narrow constitutional question before it: whether the State could continue to deprive Donaldson of physical liberty despite the absence of any demonstrated justification for doing so.
Mental illness alone is not a constitutionally sufficient basis for indefinite involuntary custodial confinement. Even assuming that mental illness can be reliably defined and diagnosed, its presence does not establish that a person must be locked away when he can live safely outside an institution.
Nor could the State justify confinement simply by asserting that institutional life might offer Donaldson a better standard of living. The State may provide care and assistance to persons in need, but a person capable of surviving safely in freedom may prefer life outside an institution. Confinement is rarely necessary merely to improve a person's living conditions.
The State also may not imprison harmless people simply because the public finds them unusual, unsettling, or socially unacceptable. Public intolerance is not a legitimate constitutional ground for depriving a person of physical liberty.
A valid initial commitment does not itself authorize confinement forever. Continued confinement must remain justified as circumstances change. Because O'Connor knowingly kept Donaldson confined despite his harmlessness and ability to live safely with available support, the jury properly found a violation of Donaldson's constitutional right to liberty.