Back in the day when I was a LEO (1980's), You were not permitted to put a knee on someones neck during a takedown. A knee in the ribcage on your way down was suggested. I have noticed in the last decade or so cops putting the knee or foot on a suspects neck. I cant believe we have not had more incidents like this one. I have never understood even in liberal departments, why this takedown technique is ever permitted. Which goes back to the root of why I dislike most cops.