I think the main way is to see a lot of plays and think to yourself was the contact necessary in each situation. If you can do that, the blowing the whistle is secondary.
Every play has starts, develops and finishes. You want to call a foul at the end of that sequence as much as possible.
Peace
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Let us get into "Good Trouble."
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Charles Michael “Mick” Chambers (1947-2010)
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