I've heard veteran umpires in my association say they don't even carry a finger whistle because the only time they blow it is before the snap.
I've also had equally veteran umpires tell me that they have the whistle on anything inside.
Some guys say there should only ever be one whistle on any play.
Some guys say that you should echo a whistle if you hear one and there's still action going on in front of you.
My take is one I've heard from the guys I tend to have the most respect for in my organization: If you see the ball become dead, blow the whistle. This requires you to see the ball. If you can't see the ball, don't blow the whistle. But if you have the runner down, blow it.
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