The NFL's Latest Safety Rule Could Be the Most Impactful Yet
NFL could penalize ball carriers for lowering head
Talk of an N.F.L. Rule on Running Raises Concern - The New York Times
NFL Explains new Crown of the helmet rule
Proposed NFL Rule Change Irks Hall-of-Famer Emmitt Smith - WSJ
N.F.L. Adopts Helmet Rule and Alters Tuck Rule - The New York Times
Officiating video: use of helmet, blindside blocks, roughing the
FG rushes, crown hits, and coaches on the field are addressed in
NFL ends infamous tuck rule, adopts new helmet rule
NFL Passes Crown Of The Helmet Rule; Tuck Rule Removed