ARTICLE 15.All players are prohibited from grabbing the inside back collar of the shoulder pads or jersey, the nameplate area, or the inside collar of the side of the shoulder pads or jersey, and abruptly pulling the ball carrier down. This does not apply to a ball carrier, including a potential passer, who is inside the tackle box (Rule 2-34). Note that the tackle box disintegrates when the ball leaves it.
Approved Ruling 9-1-15 I. As ball carrier A20 races down field near the sideline, defender B56 grabs him from behind by the back of the jersey at the collar or by the collar of his shoulder pad. B56 continues with this contact for several yards but A20 does not go to the ground until tackled by another defender. RULING: Legal play. B56 did not foul because he did not abruptly pull A20 down.