“Once removed for the duration of a practice or game, the player should not be considered for return-to-football activities until he is fully asymptotic, both at rest and after exertion, has a normal neurological examination, normal neuropsychological testing, and has been cleared to return by both his team physician(s) and the independent neurological consultant.”

via FOOTBALL OUTSIDERS: Innovative Statistics, Intelligent Analysis | NFL Releases New Concussion Rules.

This rule is very long overdue. The player’s union not pushing for this kind of basic rule was a major failing of late NFLPA head Gene Upshaw’s tenure. I remember watching Jets Wide Receivers Al Toon and Wayne Chrebet have their careers brutally ended by series of concussions in two different eras. It was pretty clear the player’s well being was not being protected watching Toon and Chrebet being trotted out on the field concussion after concussion, until they couldn’t function.