Anesthesiology expert Dr. Steven Shafer holds up a bag of saline solution that can be given to a patient intravenously while under anesthesia, during Dr. Conrad Murray's involuntary manslaughter ... more 
Anesthesiology expert Dr. Steven Shafer holds up a bag of saline solution that can be given to a patient intravenously while under anesthesia, during Dr. Conrad Murray's involuntary manslaughter trial, Wednesday, Oct. 19, 2011, in downtown Los Angeles. Murray has pleaded not guilty and faces four years in prison and the loss of his medical license if convicted of involuntary manslaughter in Michael Jackson's death. (AP Photo/Reed Saxon, Pool) less 
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Associated Press | Photo By Reed Saxon, Pool
Wed, Oct 19, 2011 3:47 PM EDT