he clearly showed the influence of the drug in him , he was clearly handcuffed and thrown on the ground , in that condition he was a threat to no one, he must have been sent to hospital for treatment and then they must sent him for trial for his driving under influence of drug and alcohol . tasing him after he was under control and threat to no one was completely unjustified , and reckless use of unnecessary force . that resulted in his death .
by the way you expect somebody who use a taser is aware of the fact that he must be more careful when he use it on a person who show evidence of being under influence of drugs . those drugs make heart more excitable at cellular level and the amount of electricity that is tolerable for a normal person can be lethal for them and result in cardiac arrythmia such as Ventricular tachycardia and Ventricular Fibrillation
First of all, I personally know someone who was shot dead by a pissed out drunk, he was so drunk he wasn't even aware he was in custody and ask us why he was in jail after he got sobering up. So no, even if he is heavily intoxicated, it's not "It pose no threat to no one"
Again, tase 1 to 6 is PERFECTLY JUSTIFIED, that's what textbook for why Taser is used for, the police shouted command, the subject DISOBEY the command, and very obviously resisting arrest on video, if that is not the time to deploy taser, then it NEVER going to be. 7 would be debatable, he was not struggling, but that does not mean he was not resisting, the angle of the Bodycam is NOT enough to judge either way, so I will defer the 7th Tase to a court judgement, but seeing the benefit of the doubt ALWAYS goes to the defendant I would imagine if this is going to court and the court that tase him is in charge of some kind of murder/man he would be found the 7th tase justified as well, because I doubt there is a way to be able to see if the subject is not resisting. And if so, that doubt went to the defendant.
I don't know as I am not an expert on who looks like they are under the influence, I mean, as a cop for over a decade, I can never distinguish between a person who high on drug or a person who just have too little to sleep by the way of just looking at them, you know when you interact with these people extensively, and for sure when you give them a field sobriety test, I don't think the cops went that far in this case.
On the other hand, if he would have a bad reaction to taser because of the elevated adrenaline level leads to cardiac arrythmia, that would have shown in the first hour of being tased, not 5 hours after he was in a hospital.