I have to say that a lot of the commentary on this thread is deeply irrational.
If you actually watch the heavily edited video (and it was heavily edited by someone with an anti-police agenda, and probably leaves out footage complimentary to the police and detrimental to the crook), it is remarkable how professionally Garner was treated.
The entire sequence from the beginning of the takedown, to Garner experiencing distress, to alerting EMS took about 15 seconds.
A careful analysis of the available video also shows that there was no "choke hold" but a headlock.
Go flip your minnow Clyde.