ABCNews -- A nurse close to Michael Jackson said that the pop legend was asking for the powerful drug Diprivan in the days before his death, but some pain specialists say such use of the drug would be highly unusual since it's ordinarily given in a hospital setting due to its health risks. The drug -- known generically as propofol -- is most often used to sedate patients before a medical procedure, but it is also one that palliative care workers have been known to administer to terminal patients who are in pain or who have weeks or days to live as a form of "palliative sedation." An injection of the drug requires someone to be present in order to continuously administer it intravenously, said Dr. Howard Nearman, chair of anesthesiology at University...