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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. ==College football== 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 wide receivers 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) Players may only wear eligible numbers at an ineligible position when it is obvious that a punt or field goal is to be attempted. 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). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eligible receiver」の詳細全文を読む スポンサード リンク
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