Personally, I feel that in order for the truth to brought to light, victims have to be willing to revictimize themselves, either spiritually, like a rape victim having to repeat their testimony over and over again to people who are trying to tear it apart, or physically, like Sandra's body being submitted for another autopsy, in order for all the evidence to be discovered.
Also, in order to convict criminals based on evidence and not the wild emotional need to punish someone when the unimaginable happens, both the defense and the prosecution need to be able to conduct their own investigation. Someone earlier in the thread posted an account of an incompetent medical examiner. It happens. Prosecutors and LE are human; they're not immune to bias and corruption. To ensure that criminals are convicted on the correct charges, evidence, i.e. the body, needs to be looked at from both sides.
