We try and use a whistle on every sub. It is good communication between partners and I think we have found that it prevents a lot of problems because it means someone is watching....
We dont use whistles on the other stuff you describe. However there are a few of us that blow the whistle on most baseline plays when the ball is coming in. Rule states anythine there is a substantial delay... If there has been a sub or any time of delay I blow my whistle; worka a lot better than telling players ball is in play. Coach has no excuse if they get burned on an inbound play because everyone hears the whistle.
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