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I don't think there's a hard and fast rule for whistle kept in the mouth. I keep my whistle in my mouth during the play. I've had like maybe 1 IW in approximately 125 games. However, I've been a basketball official for years who's lived with the whistle being there and I have about as good whistle control as it gets.
You decide. If you learn to be slow on the whistle, as I am, then you should be fine. If not, then you either need to keep it out or practice slowing down.
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