AlaBamFan

The NCAA says: When an offensive player is in a passing posture with one or both feet on the ground, no defensive player rushing unabated shall hit him forcibly at the knee area or below. The defensive player also may not initiate a roll or lunge and forcibly hit this opponent in the knee area or below. [Exceptions: (1) It is not a foul if the offensive player is a runner not in a passing posture, either inside or outside the tackle box. (2) It is not a foul if the defender grabs or wraps this opponent in an attempt to make a conventional tackle without making forcible contact with the head or shoulder. (3) It is not a foul if the defender is not rushing unabated or is blocked or fouled into this opponent.]