Cite as: 521 U. S. 702 (1997)
Opinion of the Court
decisions." Id., at 278. Therefore, "for purposes of [that] case, we assume[d] that the United States Constitution would grant a competent person a constitutionally protected right to refuse lifesaving hydration and nutrition." Id., at 279; see id., at 287 (O’Connor, J., concurring). We concluded that, notwithstanding this right, the Constitution permitted Missouri to require clear and convincing evidence of an incompetent patient's wishes concerning the withdrawal of life-sustaining treatment. Id., at 280-281.
Respondents contend that in Cruzan we "acknowledged that competent, dying persons have the right to direct the removal of life-sustaining medical treatment and thus hasten death," Brief for Respondents 23, and that "the constitutional principle behind recognizing the patient's liberty to direct the withdrawal of artificial life support applies at least as strongly to the choice to hasten impending death by consuming lethal medication," id., at 26. Similarly, the Court of Appeals concluded that "Cruzan, by recognizing a liberty interest that includes the refusal of artificial provision of life-sustaining food and water, necessarily recognize[d] a liberty interest in hastening one's own death." 79 F. 3d, at 816.
The right assumed in Cruzan, however, was not simply deduced from abstract concepts of personal autonomy. Given the common-law rule that forced medication was a battery, and the long legal tradition protecting the decision to refuse unwanted medical treatment, our assumption was entirely consistent with this Nation's history and constitutional traditions. The decision to commit suicide with the assistance of another may be just as personal and profound as the decision to refuse unwanted medical treatment, but it has never enjoyed similar legal protection. Indeed, the two acts are widely and reasonably regarded as quite distinct. See Quill v. Vacco, post, at 800-808. In Cruzan itself, we recognized that most States outlawed assisted suicide—and even more do today—and we certainly gave no intimation that the right to refuse unwanted medical treatment could be some-
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