chokehold is meant to ... CHOKE (crush the windpipe, stop breath) which is illegal for NYPD but was done. forearm or upper arm crushing the windpipe.
the approved alternative is to have the crotch of the elbow in front of the windpipe, no crushing, while upper arm and forearm crush the carotids, blood flow to brain stopped, causing the victim to black out (so the police can beat the out him without resistance, then file a report "resisting arrest")