There is no easy test...its not lke take xray, see broken bone, diagnose broken bone. The NFL and its fans want Josh Allen to go back in there, I could see them adopting/further making changes to the protocols similar to rugby to appease the public perception but at the end of the day, a very high percentage of concussions go undiagnosed and the NFL is ok with that as are most fans. What happened with Josh demonstrated how ridiculous their protocol is. At the end of the day it is up to the individual player to decide how to handle such situations. The protocol is very "beatable" and ex players have discussed this. Josh was out briefly, it was not that different than the TUA situation, from the stand point, it was obvious there was a head injury in both cases. Fan reactions of the Dolphins and Bills is totally based on if they are a fan of that team or not.