Don't know about other sports, but it is a requirement to have it available in football. I've been working in Ohio since 1991 never pulled it out during the game. The coach has to burn a timeout if he's wrong to take a look. We've questioned ourselves and looked stuff up at half time. Most coaches don't know we have it there and secondly, don't want to burn the TO. They don't know the rules well enough themselves to take a chance on lossing the TO.
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