The prosecutors closing argument is having Dr. Tobin declare Floyd's O2 level was 98% when taken at the hospital... to discredit the carbon monoxide theory.
Is that normal for an asphyxiation victim? To my laymind, that would imply the lungs were working until the point the heart wasn't.
... I was probably walking around with a lot less than that before I quit smoking/before the hospital sucked 32 years of tar out of my lungs.