Several NFL teams also proposed that the league switch to one single preseason roster reduction date, as opposed to two, and that rule change also passed Tuesday.

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The use of Guardian Caps on top of players' helmets was also expanded to include running backs and fullbacks on top of linebackers, tight ends and linemen on both sides of the ball -- and to include in-season contact practices instead of just the preseason.

The league also voted to expand instant replay for greater review on failed fourth-down attempts, proposed by the Houston Texans.

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--Field Level Media