MINNEAPOLIS — The latest attempt by star running back Adrian Peterson to get back on the field will come in a federal courtroom. Attorneys for the NFL Players Association were scheduled to argue Friday for the Minnesota Vikings standout's reinstatement from a suspension levied by the league under its divisive personal conduct policy. The punishment, stemming from the child abuse case involving Peterson and one of his young sons, has widened the divide between the NFL and the NFLPA over player discipline.