In the Quinlan case, the court allowed a competent patient to terminate the use of life-sustaining medical machines to prolong life. Since New Jersey's decision, all fifty states have enacted similar statutes which contain living will provisions. However, although the United States Supreme Court upheld the Quinlan decision in re Cruzan , it changed the parameters of passive euthanasia . With the Cruzan decision, the Supreme Court held that passive euthanasia was legal but only for competent adults or those who are incompetent but have previously procured a living will. However, if the patient is without a living will and incompetent, it becomes the burden of the family to prove that there is "clear and convincing evidence" to the affect that the patient does not want to continue living in a vegetative state.
             As to active euthanasia, there has been no Supreme Court ruling deter
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