The replay timing rule change that's not in the rulebook – Football Zebras
Replay review in gridiron football - Wikipedia
NFL owners approve three rule changes for 2020 season
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Replay in sports isn't the problem — judgment is - The Boston Globe
30 Changes Needed In Sports. I love sports. There is so much to love…, by Peter Bobrinskoy
NFL Replay Officials NFL Football Operations
NFL rule changes: Modified instant replay, more positions allowed to wear single-digit jerseys - The Washington Post
NFL pass interference rule 2019: Explaining the new challenge, replay process for PI
NFL Adopts Changes to Instant Replay Review System
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Game changer: NFL approves replay reviews of pass interference