Firstly, did Floyd swallow the fentanyl tablets when he was arrested to avoid being charged for possession?(common occurrence) If so, there was not enough time for the tablets to cause an overdose.....it would take at least 20 or 30 mins to begin to take effect.
Secondly, an addict usually knows his limits. He would be unlikely to swallow an amount he knew would be lethal - arrested or not (it’s not worth dying over) - and having three times the “lethal” dose for a NON user is not necessarily going to have the same effect on an addict. Habituation raises the level at which a drug will cause harm to a person.
All these things will be assessed by an expert witness in court*. The initial coroner will not necessarily be such an expert.
And thirdly, should breaking the law, being an addict or passing off fake notes (because you are an addict) be deserving of a death sentence?!
Most cops in this situation get away with it. Unfortunately for Chauvin, he is going to be made to pay for generations of sociopaths within the police service. 2% of the population have sociopathic tendencies. Not all of them act on these tendencies and not all of them are in positions of power - medicine, nursing, policing, the armed forces, social work - where their behaviour negatively impacts members of the public or even puts them in danger, as is the case with Chauvin (unfortunate name, too!)
* I would hope. It’s surprising how poor some lawyers are (as we’ve seen with Watchtower court cases. We’ve also seen some amazing legal minds at work too, of course)