American Football NCAA Rule 8-5-1-a

The ball becomes dead out of bounds behind a goal line, except from an incomplete forward pass, or becomes dead in the possession of a player on, above or behind their own goal line, or becomes dead by rule, and the defending team is responsible for the ball being there (A.R. 6-3-1-IV; A.R. 7-2-4-I; A.R. 8-5-1-I-II, IV and VI-X; A.R. 8-7-2-II; and A.R. 9-4-1-VIII). When in question, it is a touchback, not a safety.
Exception:
It is not a safety if a player between their own team’s five-yard line and goal line:
(a) intercepts a pass or fumble; or recovers an opponent’s fumble or backward pass; or catches or recovers a kick; and
(b) the player’s original momentum carries that player into their own end zone; and
(c) the ball remains behind that team’s goal line and is declared dead in that team’s possession there. This includes a fumble that goes from the end zone into the field of play and out of bounds (Rule 7-2-4-b-1). If conditions (a)-(c) are satisfied above, the ball belongs to this player’s team at the spot where that player gained possession.