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I have used a whistle in my pocket for years. I think that only other officials or evaluators even know what you are doing. I have had hundreds of fans come up and asked me how i know who the next jump ball goes to so quickly. I tell them that i carry a whistle in my pocket, and i move it from side to side. I think for the most part, only other officials see tht we may change a whistle in our pocket.
JMO
AK ref SE
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