Originally Posted by gilliam
Write a Living Will and you will probably be safe.
Probably being the key word. Living Will won't cut it. Unless you specify every question that could possible come up (which we could never anticipate), the state will seize control of the unanswered questions. Further, withouth additional legal guards (such as power of attorney), relatives can sue overtop of the living will.
Your best bet is Power of Attorney and a Health Care Proxy that puts 1 person you trust in control of decisions.