I don't know the first thing about being a ME, but I thought they did the autopsy, lab tests, etc. and made a determination?
Perper has maybe looked at computers, done interviews with parties that may or may not have an interest in the outcome of his reports, etc.-I am a little confused on this.
Following is an excerpt from THE JURISDICTION AND RESPONSIBILITIES OF THE MEDICAL EXAMINER'S OFFICE
http://www.broward.org/medical/tmi03602.pdf
The Medical Examiner and his Associate Medical Examiners base their determination of cause and manner of death on the integration of data provided by law enforcement investigators and investigators of the Broward County Medical Examiner's Office, personal scene investigations, medical records, interviews of witnesses and physicians, autopsy findings and toxicology testing results of body fluids and tissues for alcohol, drugs of addiction, medications and toxic substances.
Maybe Perper talks so much so that he has name recognition when he writes his book about this case.