Which Supreme Court case ruled that mental illness and a need for treatment are not sufficient justifications for the involuntary commitment for those not dangerous?

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O'Connor v. Donaldson (1975) established that a state cannot constitutionally confine a non-dangerous individual who is capable of surviving safely in freedom by themselves or with the help of willing and responsible family or friends. This case clarified that mental illness alone is not enough for involuntary commitment if the person is not a danger to themselves or others.

Which Supreme Court Case Ruled That Mental Illness and a Need