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This rule refers to catches made in the end zone. The "going to the ground" rule says that a receiver must retain possession of the ball through the "process of the catch." What makes this a controversial rule is to define the process of a catch in the end zone and how that differs from other touchdowns.
When a player breaks the plain of the goal line while running the ball with just a smidgen of the football, it is a touchdown. Even if the ball gets knocked out of his control moments later.
But in this "process" rule, a receiver could catch the ball in the end zone, land with both feet and his butt in-bounds with the ball under his control, but have the ball jarred out as he lands on the ground and it is not ruled a touchdown. This exact scenario happened to Detroit standout receiver Calvin Johnson in a game ending call last season, which is why the rule is commonly referred to as the "Calvin Johnson rule."
The committee needs to clarify what it means to score a touchdown. How long does the ball have to break the plane of the goal line and how long does it have to remain in the possession of the ball carrier?
Rule Change: Abolish the "process" definition and award a touchdown to a player who catches the ball and lands with both feet inbounds in the end zone.
The NFL committee has done a great job of clarifying rules in the past and I expect they'll remedy a few more this spring when they meet again. Starting with these three suggestions is a great place would continue the trend.
Good luck to Mark and the rest of the gang in maintaining the NFL's commitment to improvement and excellence.