Instant replay in American and Canadian football  From
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American and Canadian football, instant replay 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.  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. Examples of plays that cannot be
reviewed – even if replays would show an incorrect call was made
– include a quarterback fumble recovered by the defensive team
that is ruled an incomplete pass and thus whistled dead, or a
player ruled downed or out of bounds when in fact he was not.
American and Canadian footb