Professional football players failed to allege a viable negligence claim against the NFL on a theory of negligence per se in distributing prescription pain killers and other drugs to enable injured players to continue competing. The complaint did not allege facts showing that the NFL directly or indirectly supplied players with drugs or coordinated activities of clubs to do so, rather it was the individual clubs doctors and trainers that gave the players the drugs. However, the players did allege a viable claim for negligence under a voluntary undertaking theory. The NFL voluntarily undertook to adopt and enforce league-wide rules for the proper administratioin of prescription drugs, but then never sought to enforce the rules it had adopted, and as a result players sustained more severe injuries from being drugged and sent back to play too soon. However, the trial court must reexamine whether section 301 of the LMRA preempts the voluntary undertaking claim.