American Football NCAA Rules 4-1-3-k, m and n

k. When a live ball not in player possession touches anything inbounds other than a player, a player’s equipment, an official, an official’s equipment or the ground (inadvertent-whistle provisions apply).
m. When the ball becomes illegal while in play (inadvertent-whistle provisions apply).
n. When a live ball comes into possession of an official (inadvertent-whistle provisions apply).