William Rehnquist,
Cruzan v. Director, Missouri Department of Health…
“ While continuing to recognize a common-law right to refuse treatment, the court rejected the substituted judgment approach for asserting it "because it is inconsistent with our fundamental commitment to the notion that no person or court should substitute its judgment as to what would be an acceptable quality of life for another. Consequently, we adhere to the view that, despite its pitfalls and inevitable uncertainties, the inquiry must always be narrowed to the patient's expressed intent, with every effort made to minimize the opportunity for error." ”
