"There was a nearly lifeless body face down on the floor. That would be evidence of foul play, wouldn't you think?" Not by itself. It would not rule out foul play on its face but certainly is not by itself evidence.
Bloodwork is not going to show evidence of violence. Marks on the body, broken bones, unexplained cuts, bruises or contusions would. Apparently none of that existed. You really need to reason TO a conclusion not FROM one.
Even after extensive tests many cases cannot really be explained with a cause of death.
Do you TRY and miss the point when you don't like the implications? We were speaking of cases of death through UNKNOWN reasons not cases of domestic abuse (there is almost always PLENTY of evidence of abuse there) or auto accidents.
There was NO evidence that Michael ever abused Terri. Not in the blood not in the bones NONE. But grasping at straws seems to be a pasttime for those trying to convict him of killing her.
Sure it can.