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The use of the whistle is required per the NFHS manual for bringing in substitutes.
The horn from the table is merely to alert the officials to the situation. It is not a signal to the substitute to enter.
The use of the whistle makes it clear to everyone that the sub may now enter. It is cleaner.
Even the NCAA is moving this direction. The NCAAW made the whistle a required mechanic a couple of years ago.
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