Dr. Christopher Rogers, deputy medical examiner at the Los Angeles Coroner’s Office, left, is shown an empty prescription bottle of Lorazepam from Deputy district attorney David Walgren during Conrad Murray’s involuntary manslaughter trial, Tuesday, Oct. 11, 2011, in downtown Los Angeles. Murray has pleaded not guilty and faces four years in prison and the loss […]

Dr. Christopher Rogers, deputy medical examiner at the Los Angeles Coroner’s Office, left, is shown an empty prescription bottle of Lorazepam from Deputy district attorney David Walgren during Conrad Murray’s involuntary manslaughter trial, Tuesday, Oct. 11, 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/Robyn Beck, Pool)