@FFGhost - Dr Martin Tobin says in your link that Chauvin had his knee pressed down on Floyd's neck but elsewhere in this thread I've posted a youtube video showing photographic evidence that shows Chauvin's knee was across Floyd's shoulders.
What do you make of this photographic evidence?
Well, so much for the "died by overdose" defense attempt - the prosecution are alleging murder. In a US court, murder has to be established beyond reasonable doubt.
There's quite a lot of stuff posted here which is reasonable doubt that Chauvin murdered George Floyd.