https://medium.com/@gavrilodavid/why-derek-chauvin-may-get-off-his-murder-charge-2e2ad8d0911
https://www.newsweek.com/george-floyd-couldnt-breathe-before-he-was-pinned-down-cops-prosecutor-says-1507608
https://www.youtube.com/watch?v=tmol05Uftv8
Not relevant.
Justification for using restraint techniques ends when resistance ends - which in this case was at least five minutes before Floyd died.