$.02...
Just like anything else, common sense has to be applied... If there is reasonable doubt as to whether the player is down or the play has ended, then a hit on the ballcarrier, if otherwise clean, probably won't be flagged... If the player is obviously down, then a late hit gets flagged, regardless of the whistle...
The only whistle guideline I can provide is this:
If the whistle has blown, the play is dead.
The opposite statement:
If the whistle has not blown, the play is not dead.
is FALSE
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