The NFL is weighing nine rules changes and multiple bylaw changes, including several submitted by the Detroit Lions. All three of the team's rules proposals have to do with altering the league's officiating system.
The first would see the league expand a coach's ability to challenge personal-foul calls. It's possible this gains some momentum with other franchises, given a number of controversies related to unnecessary-roughness calls on quarterbacks in recent seasons.
In addition to that proposal, the Lions have also suggested increased opportunities for teams to gain a third coach's challenge, as well as the expansion of the league's replay official's jurisdiction on penalty calls, as well as assistance spotting the ball and correcting the game clock.