A Blind Study:
Two bodies
A coroner who doesn't know who either guy is
One corpse homicide by asphyxia
The other any other similar cause of death
Or, the reverse
Two bodies (same)
Two coroners who do not know who either guy is.
Or any possible variation on this. And see what happens.
Like neither corpse is a homicide at all.
Main point being they do not know who they are doing the autopsy on.
This Floyd guy is famous at this point, you could send the body to Timbuktu and they would declare without a single doubt, 100% certain that it was a homicide. It would literally be dangerous for them and their family to rule any other way.