Ok, so I just watched the video for the first time
Here's my impressions.
The cop did apply a chokehold. It lasted 13 seconds. The chokehold was 100% suffocating as there is not a noise made by Garner for the 13 seconds it's applied. He was talking just before he got taken down and immediately after the chokehold was released, this is pretty clear evidence to me that the chokehold completely occluded his airway for 13 seconds. When he says "I can't breathe", he ain't joking. I've been in medicine for 15 years and have taken care of many, many people with asthma and COPD attacks that are on deaths door steps and this is what they sound like just before they die. He's gasping for air just to say "I can't breathe". After he says he can't breathe, there was another 17 seconds of the cop pushing his head into the ground further complicating the medical issue.
Now, I feel very comfortable saying that Eric Garner died of an acute asthma attack or a laryngeal spasm that was caused by the chokehold applied by the officer. Personally, I feel everything above is beyond discussion. However I understand how someone could argue how tight the chokehold was. But going completely silent when being choked is a sign of complete airway occlusion. Also, the fact he literally couldn't breathe after the choke indicates it was very tight. Add in he apparently just broke up a fight and was walking down the street indicates normal exertion is not a problem for him, it would take something else like this chokehold to really push him over the edge. And it did. Everything points to this chokehold being completely occlusive.
With that said it's really all about whether or not you believe Garner deserved to be taken down and whether the chokehold was appropriate.
I've already said Garner should not have resisted and stand by this. But beyond this, I also think prior to it escalating to this point, the officers should have just written him a ticket and let the courts sort out the problem.
Ultimately my final verdict is contributory negligence and both parties are guilty. I would have absolutely indicted him and let a jury figure everything else out. But I feel very strongly he should have at least been indicted. I don't feel near as strongly as whether I would find him guilty of anything at trial. But I think it should have went.