Official Rules and Notable Rule Distinctions
See also: American football rulesAlthough rules for the high school, college, and NFL games are generally consistent, there are several minor differences. The NCAA Football Rules Committee determines the playing rules for Division I (both Bowl and Championship Subdivisions), II, and III games (the National Association of Intercollegiate Athletics (NAIA) is a separate organization, but uses the NCAA rules).
- A pass is ruled complete if one of the receiver's feet is inbounds at the time of the catch. In the NFL both feet must be inbounds.
- A player is considered down when any part of his body other than the feet or hands touches the ground or when the ball carrier is tackled or otherwise falls and loses possession of the ball as he contacts the ground with any part of his body, with the sole exception of the holder for field goal and extra point attempts. In the NFL a player is active until he is tackled or forced down by a member of the opposing team (down by contact).
- The clock stops after the offense completes a first down and begins again—assuming it is following a play in which the clock would not normally stop—once the referee declares the ball ready for play. In the NFL the clock does not explicitly stop for a first down.
- Overtime was introduced in 1996, eliminating ties. When a game goes to overtime, each team is given one possession from its opponent's twenty-five yard line with no game clock, despite the one timeout per period and use of play clock. The team leading after both possessions is declared the winner. If the teams remain tied, overtime periods continue, with a coin flip determining the first possession. Possessions alternate with each overtime, until one team leads the other at the end of the overtime. Starting with the third overtime, a one point PAT field goal after a touchdown is no longer allowed, forcing teams to attempt a two-point conversion after a touchdown. (In the NFL overtime is decided by a 15-minute sudden-death quarter, and regular season games can still end in a tie if neither team scores. Overtime for regular season games in the NFL began with the 1974 season. In the post-season, if the teams are still tied, teams will play additional overtime periods until either team scores.)
- Extra point tries are attempted from the three-yard line. The NFL uses the two-yard line. This counts as one point. Teams can also go for "the two-point conversion" which is when a team will line up at the three yard line and try to score. If they are successful, they receive two points, if they are not, then they receive zero points. The two-point conversion was not implemented in the NFL until 1994, but it had been previously used in the old American Football League (AFL) before it merged with the NFL in 1970.
- The defensive team may score two points on a point-after touchdown attempt by returning a blocked kick, fumble, or interception into the opposition's end zone. In addition, if the defensive team gains possession, but then moves backwards into the endzone and is stopped, a one point safety will be awarded to the offense, although, unlike a real safety, the offense kicks off, opposed to the team charged with the safety. This college rule was added in 1988. In the NFL, a conversion attempt ends when the defending team gains possession of the football.
- The two-minute warning is not used in college football, except in rare cases where the scoreboard clock has malfunctioned and is not being used.
- There is an option to use instant replay review of officiating decisions. Division I FBS (formerly Division I-A) schools use replay in virtually all games; replay is rarely used in lower division games. Every play is subject to booth review with coaches only having one challenge. In the NFL, only scoring plays, turnovers, the final 2:00 of each half and all overtime periods are reviewed, and coaches are issued two challenges (with the option for a 3rd if the first two are successful).
- In the 2006 season, the game clock was started when the ball was declared ready for play after the defensive team (during a scrimmage down) or the kick-receiving team (during a free kick down) was awarded a first down (change of possession), reducing the time of games. This rule only lasted one year.
- In the 1984 season, the ball was placed on the 30 yard line (instead of the 20) if a kickoff sailed through the end zone on the fly and untouched. This rule was rescinded after one year.
- Starting with the 2012 season, the ball is placed on the 25-yard line following a touchback on a kickoff. At all other levels of football, plus all other touchback situations under NCAA rules, the ball is placed on the 20.
- Among other rule changes in 2007, kickoffs were moved from the 35-yard line back five yards to the 30-yard line, matching a change that the NFL had made in 1994. Some coaches and officials questioned this rule change as it could lead to more injuries to the players as there will likely be more kickoff returns. The rationale for the rule change was to help reduce dead time in the game. The NFL returned its kickoff location to the 35-yard line effective in 2011; college football did not do so until 2012.
- Several changes were made to college rules in 2011, all of which differ from NFL practice:
- if a player is penalized for unsportsmanlike conduct for actions that occurred during a play ending in a touchdown by that team, but before the goal line was crossed, the touchdown will be nullified. In the NFL, the same foul would result in a penalty on the conversion attempt or ensuing kickoff, at the option of the non-penalized team.
- If a team is penalized in the final minute of a half and the penalty causes the clock to stop, the opposing team now has the right to have 10 seconds run off the clock in addition to the yardage penalty. The NFL has a similar rule in the final minute of the half, but it applies only to specified violations against the offensive team. The new NCAA rule applies to penalties on both sides of the ball.
- Players lined up outside the tackle box—more specifically, those lined up more than 7 yards from the center—will now be allowed to block below the waist only if they are blocking straight ahead or toward the nearest sideline.
- On placekicks, no offensive lineman can now be engaged by more than two defensive players. A violation will be a 5-yard penalty.
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