Though witness not necessarily to be present at the time of dispute, he or she can serve a key role in winning the case. Such people are known as Medical Malpractice Expert Witness. Medical negligence is a failure to diagnose and/or to treat the disease or symptom. This could be due to apathy of the health care provider for what there are strict laws in every state. The victim can file a case for compensation to heal the physical and/or mental damage.