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- In gridiron football, replay review is a method of reviewing a play using cameras at various angles to determine the accuracy of the initial call of the officials. An instant replay can take place in the event of a close or otherwise controversial call, either at the request of a team's head coach (with limitations) or the officials themselves. Replay reviews are utilized in some high school games, and also for many games at the college level and above. Before the 2019 season, the National Federation of State High School Associations (NFHS), which establishes the rules for most high school and youth organizations in the United States (though not for Texas high schools), did not allow replay reviews even when the equipment exists to enable the practice. Effective in 2019, NFHS gave its member associations the option to allow replay review, but only in postseason games. In those leagues that utilize replay reviews, there are restrictions on what types of plays can be reviewed. In general, most penalty calls or lack thereof cannot be reviewed, nor can a play that is whistled dead by the officials before the play could come to its rightful end. American and Canadian football leagues vary in their application and use of instant replay review. (en)
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