During my training days I chose to spend three weeks in forensic pathology. In other words, medical examiner's office. It was during a gang war of sorts and I learned more about gun related deaths and investigations relating to police shootings than I am contractually allowed to share. A person could spend a lifetime learning the finer arts of that specialty.
What I will say is this: any "for-hire" pathologist is like any "for-hire" lawyer. I do not need to elaborate. Coroner's offices that give independent reports DO NOT work for the police. They may work for the county, but that is the extent of the relationship. For each autopsy we painstakingly completed we sat and gave findings as objectively and, as possible, completely word-for-word to each side of a case. What was impressive was how differently each side twisted things and begged for more details that frankly were not there. If you do not have a bullet or casings, you do not know how many shots were fired. If you have not fired that exact same gun and cartridge, you do not know the powder/flash range exactly. The angle of entry is completely useless unless you consider the possibilities of the arc of a circle (i.e. officer on the ground shooting up etc). To speak on the matter as if you have such knowledge is wholesomely irresponsible and makes me shudder that this guy ever took the oath to protect and serve humanity to the best of his ability upon completing medical school. His job is to be objective. NOTHING MORE. Medical examiners are supposed to provide data like a computer without analysis.