We don't breathe through our throats. Are you saying there's evidence that synthetic cannabinoids cause damage to the trachea?
What I suspect is that they actually want to examine neck tissue for reasons related to length of chokehold (there would be a number of microscopic bleed-outs into the neck area, I would think, if the pressure were tight enough - sort of like internal bruising. I guess we have to wait to find out.
The tox panel of course will tell whether Neely was taking any substance that would have depressed respiration on its own - the neck study might tell whether the hold was long enough to kill any person kept away from oxygen for the length of time indicated by the microscopic bleeding. It's called petechiae. I would expect a crushed larynx/windpipe but the number of petechiae and the areas where they are found would indicate something about the length of the struggle and the length of the dying process. IMO.
I'm certainly no expert in strangulation. But I would think that such a study would help determine whether the person choked to death or died from outright asphyxiation. The bruising and tiny bleeds would be on the inside of the neck (as opposed to on the outside where it would be clear it was a manual strangulation - this was not a manual strangulation, so maybe more complex).
Just speculating. IMO. Below article is just an overview, there are lots of more specific studies in the medical lit.
ory was ligature strangulation with 48 deaths (21 male, 27 female). Petechiae were present in the conjunctivae and/or sclerae in 86% of the cases; fractures of the hyoid and/or thyroid cartilage were present in 12.5%. There were a total of 41 deaths from manual strangulation (27 female, 14...
journals.lww.com