724
Opinion of the Court
process line of cases, if not with this Nation's history and practice. Pointing to Casey and Cruzan, respondents read our jurisprudence in this area as reflecting a general tradition of "self-sovereignty," Brief for Respondents 12, and as teaching that the "liberty" protected by the Due Process Clause includes "basic and intimate exercises of personal autonomy," id., at 10; see Casey, 505 U. S., at 847 ("It is a promise of the Constitution that there is a realm of personal liberty which the government may not enter"). According to respondents, our liberty jurisprudence, and the broad, individualistic principles it reflects, protects the "liberty of competent, terminally ill adults to make end-of-life decisions free of undue government interference." Brief for Respondents 10. The question presented in this case, however, is whether the protections of the Due Process Clause include a right to commit suicide with another's assistance. With this "careful description" of respondents' claim in mind, we turn to Casey and Cruzan.
In Cruzan, we considered whether Nancy Beth Cruzan, who had been severely injured in an automobile accident and was in a persistive vegetative state, "ha[d] a right under the United States Constitution which would require the hospital to withdraw life-sustaining treatment" at her parents' request. 497 U. S., at 269. We began with the observation that "[a]t common law, even the touching of one person by another without consent and without legal justification was a battery." Ibid. We then discussed the related rule that "informed consent is generally required for medical treatment." Ibid. After reviewing a long line of relevant state cases, we concluded that "the common-law doctrine of informed consent is viewed as generally encompassing the right of a competent individual to refuse medical treatment." Id., at 277. Next, we reviewed our own cases on the subject, and stated that "[t]he principle that a competent person has a constitutionally protected liberty interest in refusing unwanted medical treatment may be inferred from our prior
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