PLANO -- Alberto Riveron, the NFL's senior vice president of officiating, strolled up and down the aisle of the ballroom inside the Renaissance Dallas hotel with an Xbox controller in his hand.
For 45 minutes, he lectured to the contingent of NFL referees and supervisors on hand for the NFL's Officiating Clinic and dissected multiple video examples of rule changes and points of emphasis this coming fall. After going over backside holding, a change in leaping and celebration rules, Riveron arrived at the final point of his presentation, an addition to the rule book that's been talked about since the fourth quarter of the NFC Championship Game.