In the Cruzan case, what did the U.S. Supreme Court say about a constitutional right to refuse unwanted medical care? Nancy Cruzan's parents failed to prove the existence of such a constitutional right by clear and convincing evidence There is no right under the U.S. Constitution to refuse unwanted medical care There may be a right under the U.S. Constitution to refuse unwanted medical care There is a right under the U.S. Constitution to refuse unwanted medical care