The whistle on the hand has nothing to do with injury. Any good official would not have the whistle in their mouth at all during play. You do not want to blow the whistle too soon. One of the remedies is to wear a finger whistle. I do not like that style, but the NFL does not seem to have a problem with it for certain officials.
Peace
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Let us get into "Good Trouble."
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Charles Michael “Mick” Chambers (1947-2010)
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