The NFL playoff game at mile high Denver, CO showed a player receiving some oxygen. He had this clear plastic bag hanging under his mouth. Does anyone know what that is for? Is the O2 in that little bag? Why don't they just give him a cannula or a mask. Just curious. Not that I really care, but we all know you need a prescription to receive oxygen. How do they get around that by law? Does the team medical doctor just write the whole team a prescription just in case.