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But making a change that involves runners with the ball would be problematic, Pereira said. He noted that it has been discussed by league executives in the past.

“When you try to protect a runner, the winner is the guy who gets the lowest,” Pereira said. “With both players going down at each other, the notion to make the runner defenseless essentially can make it impossible to officiate. Who made the contact first?

“In this day and age, I would not be surprised if they look at it, but it’s hard to prove the runner is defenseless or the tackler is defenseless if the runner has lowered his helmet.

“I understand why people say this: `If you say you are concerned about concussions, why not make all helmet hits illegal? But realistically, there is no way to legislate it out of the game.”