Whether the official measure can go negative or not on a practical level it clearly can. I saw my father near the end--the morphine robbed him of the ability t

Whether the official measure can go negative or not on a practical level it clearly can. I saw my father near the end--the morphine robbed him of the ability to make long term memory. From when he was on that dose it was short term memory only, his world was frozen to before that point. And he was still in pain. How can that be anything but a negative quality of life?