Dies in the octagon due to a brutal fight and the opponent test positive for any band substance weather it's weed to coke to steroids, will they be held accountable and brought to court and charged with man slaughter?
If I'm at work and kill someone and turns out I'm drunk and I held accountable?
Is there a difference? 
i think the death would be on the medical doctors or who ever clears the fighter to fight responsibility. or maybe the fight team did some shady shit with the training or weight cut that caused the death. also the ref is there to prevent unnecessary damage. too many factors just to pin it on a failed ped test. and yes you kill someone at work regardless if you're drunk you're going to prison lol