In American football and Canadian football, not all players on offense are entitled to receive a forward pass. Only an eligible pass receiver may legally catch a forward pass, and only an eligible receiver may advance beyond the neutral zone if a forward pass crosses the neutral zone. If the pass is received by a non-eligible receiver, the penalty for the foul "illegal touching" is assessed. If an ineligible receiver is beyond the neutral zone when a forward pass crossing the neutral zone is thrown, a foul of "ineligible receiver downfield" (penalty—a loss of yardage, but not loss of down) is called. Each league has slightly different rules regarding who is considered an eligible receiver.
The NCAA rulebook defines eligible receivers for college football in Rule 7, Section 3, Article 3. The determining factors are the player's position on the field at the snap and their jersey number. Specifically, any players on offense wearing numbers between 50 and 79 are always ineligible. All defensive players are eligible receivers and offensive players who are not wearing an ineligible number are eligible receivers if they meet one of the following three criteria:
- Player is at either end of the group of players on the line of scrimmage (usually the split end and tight end)
- Player is lined up at least one yard behind the line of scrimmage (running backs, fullbacks, etc.)
- Player is positioned to receive a hand-to-hand snap from the center (almost always the quarterback)
If a player is to change between eligible and ineligible positions, they must physically change jersey numbers to reflect the position.
A receiver loses his eligibility by leaving the field of play unless he was forced out by a defensive player and immediately attempts to get back inbounds (Rule 7-3-4). All players on the field become eligible as soon as the ball is touched by a defensive player or an official during play (Rule 7-3-5).
In both American and Canadian professional football, every player on the defensive team is considered eligible. The offensive team must have at least seven players lined up on the line of scrimmage. Of the players on the line of scrimmage, only the two players on the ends of the line of scrimmage are eligible receivers. The remaining players are in the backfield (four in American football, five in Canadian football), including the quarterback. These backfield players are also eligible receivers. Technically, in the National Football League, the quarterback who takes the snap from "under center" is not "eligible" until another eligible receiver has touched the ball (e.g. the quarterback is eligible in a flea flicker), but is nonetheless not counted toward the seven men required on the line of scrimmage.
If, for example, eight men line up on the line of scrimmage, the team loses an eligible receiver. This can often happen when a flanker or slot receiver, who is supposed to line up behind the line of scrimmage, instead lines up on the line of scrimmage between the offensive line and a split end. In most cases where a pass is caught by an ineligible receiver, it is usually because the quarterback was under pressure and threw it to an offensive lineman out of desperation.
In many leagues eligible receivers must wear certain uniform numbers, so that the officials can more easily distinguish between eligible and ineligible receivers. In the NFL running backs must wear numbers 20 to 49, tight ends must wear numbers 80 to 89 (or 40 to 49 if the numbers 80 to 89 have been exhausted), and wide receivers must wear numbers 10 to 19 or 80 to 89. In the CFL ineligible receivers must wear numbers 50 to 69; all other numbers (including 0 and 00) may be worn by eligible receivers. A player who is not wearing a number that corresponds to an eligible receiver is ineligible even if he lines up in an eligible position. However, a player who reports to the referee that he intends to be eligible in the following play is allowed to line up and act as an eligible receiver. An example of this was a 1985 NFL game in which William Perry, wearing number 72 and normally a defensive lineman, was made an eligible receiver on an offensive play, and successfully caught a touchdown pass attempt. A more recent example, and more commonly used, has been former New England Patriots linebacker Mike Vrabel lining up as a tight end in goal line situations.
Before the snap of the ball, in the American game, backfield players may only move parallel to the line of scrimmage, only one back may be in motion at any given time, and if forward motion has occurred, the back must be still for a full second before the snap. The receiver may be in motion laterally or away from the line of scrimmage at the snap. A breach of this rule results in a penalty for illegal procedure (five yards). However, in the Canadian game, eligible receivers may move in any direction before the snap, any number may be in motion at any one time, and there is no need to be motionless before the snap.
The rules on eligible receivers only apply to forward passes. Any player may legally catch a backwards or lateral pass.
In the American game, once the play has started, eligible receivers can become ineligible depending on how the play develops. Any eligible receiver that goes out of bounds is no longer an eligible receiver and cannot receive a forward pass, unless that player re-establishes by taking three steps in bounds. Also, if a pass is touched by any eligible receiver (tipped by a defensive lineman, slips through a receiver's hands, etc.), every offensive player immediately becomes eligible. In the CFL all players become eligible receivers if a pass is touched by a member of the defensive team.
In high school football, the rules of eligibility are roughly the same as in the college game. However, as of February 2009, at least five players must wear numbers between 50 and 79 on first, second, or third down, which by rule would make them ineligible receivers. This was because of a change in the definition of a scrimmage-kick formation made by the National Federation of State High School Associations (NFHS). The change was intended to close a loophole in the rules which allowed teams to run an A-11 offense, in which a team could legally be exempted from eligibility numbering restrictions if the player receiving the snap was at least seven yards behind the line of scrimmage.
- "2006 NCAA Football Rules and Interpretations" (PDF). NCAA. July 2006. Retrieved 2007-01-26.[dead link]
- Stephenson, Craig (January 2, 2015). Watch Baylor's 390-pound lineman LaQuon McGowan catch TD pass in Cotton Bowl against Michigan State. AL.com. Retrieved January 2, 2015.
- "National Federation of State High School Associations press release". February 2009.
- Weinreb, Michael (August 28, 2008). "The A-11 offense: Ridiculous, or genius?". ESPN.com Page 2. The Walt Disney Company.
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