All whistles are sold with a special chip implanted in the plastic. The chip is actually a transmitter which savvy coaches can monitor if they have the right receiver. It also helps the guys over at the X-Files keep track of where all us zebras are at a given point in time.
If your fields are like most of mine, there are plenty of folks hanging around the perimter who could hear you and report it back to the coach. You never know who is listening, and that is good advice be it on a football field or on the telephone.
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