tuck rule

Strong safety Kurt Coleman #42 of the Philadelphia Eagles tries to stop running back Trent Richardson #33 of the Cleveland Browns during the second quarter of their season opener at Cleveland Browns Stadium on Sept. 9, 2012 in Cleveland, Ohio. (credit: Jason Miller/Getty Images)

NFL Bars Ball Carriers From Using Helmet Crown To Make Contact

NFL owners have passed a player safety rule barring ball carriers from using the crown of their helmets to make contact with a defender in the open field.