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At one point, Chernoff became testy with Shafer, snapping, "You do understand the difference between opinion and fact, don't you? You do understand that everything you've said in the last two days is your opinion, don't you?"
Chernoff added, "Would you be at all surprised if other medical experts disagree with you?"
Shafer's testimony also contradicted the earlier account of Dr. Paul White -- the anesthesiologist expert who will testify for the defense and who is a 30-year colleague and friend of Shafer's.
White earlier in the year prepared a report that said Jackson could have died from ingesting propofol, a theory Shafer picked apart on the stand Thursday.
That led to a "heated" discussion between White and attorney Chernoff, according to CNN.
The day ended with Shafer telling defense that there was no measurement of the propofol in Jackson's brain included in his coroner's report -- which should spark a robust discussion when court resumes on Monday.
CNN reports the trial is expected to go to the jury for deliberations next week.
Murray faces up to four years in prison and loss of his medical license if convicted, though a new California law could mean his sentence would be reduced to two years and be served in a county jail.
http://www.thewrap.com/music/column...xamine-dr-steven-shafer-propofol-exp?page=0,1