The picture you display shows that the knee is a couple of inches from the larynx where the trachea tube is located. Plus, he was talking.
Strangulation. If a cord or rope or other object long enough to go around your neck presses on the airway, it blocks air from getting to your lungs. No knee in front.
Drug overdose. Opioids affect your breathing. When you take too high a dose, it can slow down your breathing to the point that your body does not take in enough oxygenated air.
https://www.webmd.com/first-aid/asphyxia-overview#2-5
He had an open airway. I feel it was the fentanyl (Opiod) that caused the asthma event that got him. With an asthma event, you normally die of cardiac arrest before CO2 poisoning as your CO2 slowly builds up in the lungs and you can no longer inhale much of anything.
A better word for CO2 poisoning is hypercapnia. Because asthma causes the airways to become inflamed and narrowed, it may impact breathing and the levels of carbon dioxide in the body when it is not well controlled.
According to the findings of a new study, carbon dioxide also causes direct damage to the heart muscle, separate from the effects of oxygen deprivation, which reduces the heart’s pumping capacity and permanently impairs cardiac function. When it reaches the point of failure, cardiac arrest. Severe hypercapnia symptoms include confusion, coma, hyperventilation or excessive breathing, irregular heartbeat or arrhythmia, loss of consciousness, muscle twitching, panic attacks, and seizures. He had most of those symptoms.
Did the cop not see a medical emergency? I believe so. But so did the others and these guys are not MD’s. Murder, not a chance to be provable without a kangaroo court for BLM for fear of more cop killings.
rwood