I've already read the thread that this bit of news already came from.
This post makes the most sense out of all them.
The issue I see is the repeated tasering after the individual had already been subdued and restrained. You repeatedly hear the order, "get up" spoken with the threat of more taser if he doesn't. That's not what the taser is for. The taser is to be used to gain compliance to the extent that an uncompliant individual may be out of the officers' control, with hands and body free to potentially cause harm to officers and bystanders, possibly with a concealed weapon.
The taser is not a tool to "gain compliance" in a blanket sense. If an individual has been properly restrained and is under your control, and they can't or won't get up, well that's your burden as police officers, now, not his, anymore. You can drag/carry him outside if need be, but you can't repeatedly taser him as a means to persuade him to get up and walk under his own power.
Tasers aren't non-lethal weapons; they're less-than-lethal weapons. Ideally, they shouldn't ever cause death, but tasers can and have caused death. When you go into these situations, you don't know the medical history of the person you're confronting. He could very well have a congenital heart condition, possibly unknown to even himself. You've got to consider these things when there's a use of force, like in the video.
-szr
I'm not going to argue the officers' original intent to use it. My problem is exactly what szr talks about. Tase him once to knock him down and then get him in cuffs. The video shows that they tased him, then cuffed him, and then tased him again as he was on the floor. When he is cuffed and lying on the ground there is no reason to tase him again.