How about this part of the AMA's code of ethics :Then you best read it again. Primum non nocer - "above all do no harm", is not actually a part of the Hypocratic oath. If you wouldn't mind, please clue me in to what part of that oath exactly you think is being broken by allowing a footballer to return to the field in a concussed state?
2.1.1 Consider first the well-being of the patient.
I'd say that sending a concussed individual back into play on a contact support would violate that.