I think that the ME is to do his own investigation, and give the cause of death based on physical observations and tests( toxicology,x-rays, etc). He then states wether or not the death was natural,accidental or a homocide.
By biased, I meant that it is not to be influenced.
The ME can also list the cause of death as "undetermined"..
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Tnat isn't all he does. I heard him say that he would be speaking with the people who were near Anna and or knew of her condition prior to her death. He interviewed them. They answered his questions and gave him their accounts of her condition leading up to her death. What if he learned some information that was possibly relevant to her cause of death and it also came to light that someone he interviewed had LIED to him in his investigation. That is the kind of thing I'm talking about. You may believe that he only visually examines her body and conducts tests, but that isn't all he does.