I think things have got better in that once a player takes a big hit doctors are alerted to check him out and there are some telltale signs they can pick up on right away. We aren't that far removed from the days of players getting their bells rung and being on the ice next shift so things aren't going to happen overnight but I expect over the next decade there will be better measures. Of course some organizations are still failing the basics like the Alouettes letting Manziel finish a game after he clearly got concussed.
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