EDEN PRAIRIE, Minn. — The NFL Players Association has filed an expedited grievance with the NFL to reinstate Minnesota Vikings running back Adrian Peterson. The NFLPA cited Monday "explicit language in a signed agreement" from Sept. 18, when Peterson was placed on a special commissioner's exempt list following his indictment on felony child abuse in Texas. Peterson pleaded no contest Tuesday to a lesser charge of misdemeanor reckless assault, freeing him from the court system provided he fulfills the terms of his probation.