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As far as I know
NFL officials don't carry a rule book on the field.
NCAA football officials don't carry a rule book on the field.
NBA officials don't carry a rule book on the court.
NCAA basketball officials don't carry a rule book on the court.
MLB umpires don't carry a rule book on the field.
NCAA umpires don't carry a rule book on the field.
In fact, I can't think of a single collegiate or professional organization that requires the officials to have a rule book handy. Can anyone else?
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