New, disturbing details have emerged about an incident that got a Kansas sheriff's deputy charged with second-degree murder for the death of a Black man in custody, reported The Guardian on Friday — with the death bearing a striking resemblance to the murder of George Floyd in Minneapolis five years...
You will die before you produce enough CO2 to detect.
You actually don’t even need to breathe to do this. If you hyperventilate to expel the CO2 from your blood then hold your breath, you will run out of oxygen before you build enough CO2 up to detect.
https://en.wikipedia.org/wiki/Freediving_blackout