Dr. Paul White is testifying for Dr. Conrad Murray, who has pleaded not guilty to involuntary manslaughter in Jackson's June 2009 death.
White said Thursday he reviewed reports by more than a dozen experts. He says he wouldn't expect Jackson to have died from the drugs that Murray told police he gave the singer. Murray was giving Jackson the anesthetic propofol as a sleep aid.
A prosecution expert contends Murray likely gave Jackson propofol on an IV drip in a higher dose than he told police, and then left the room.
White says he can't justify the conduct if that's what happened, but is expected to present an alternate theory.