In part one of this look at medical experts in malpractice litigation, we hear the story of Dr. M, a physician embroiled in a dramatic legal battle after the death of a patient, and his efforts to bring the medical expert in his case to justice. We speak more with Dr. Louise Andrew, MD JD, about the necessity and ethics of medical expert testimony, and hear the voices of physicians who have been defendants, plaintiffs, and experts themselves. And we examine the psychological impact that unethical, exaggerated, or misleading expert testimony has on defendant physicians, including the story of a physician who died by suicide after being accused of witness tampering.