American Football IFAF Approved Ruling 9-1-7:I

I. After the ball is dead, a player throws himself onto an opponent lying on the ground. RULING: Personal foul. Penalty — 15 yards from the succeeding spot and first down if by a Team B player and not in conflict with other rules. “Piling on” applies to a ball carrier or to any other opponent who is prostrate when the ball becomes dead. [Cited by 9-1-7-a]