I don't have my rules book available... Earlier this year I made a defensive coach stop using a small electronic bullhorn ( about the size of his hand ) . He was using it to call in defense formations. He told me he always used it in the past. I told him it was against the rules, put it away or take 15. After the game we discussed my ruling. I check the rules book and there was specific reference supporting my call. If it is in the stands I would get word to game management to help out. If it is coming from the fans I think we should treat this as we would if a fan was blowing a whistle.
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