I’ve presented testimony from medical examiners at murder trials, and I know firsthand that it can be fraught. Medical examiners often use dense, technical medical jargon to state their findings, so juries sometimes have difficulty following along; it’s the prosecutor’s job to ensure that the examiner speaks in plain English, to the extent possible, to explain his or her conclusions. And testimony from medical examiners, naturally, can be gruesome. Juries tend to recoil at the vivid descriptions of death and its aftermath.