Inadvertant horn

[Nevadaref]

Originally Posted by BryanV21

It may not be the same everywhere, but here in Ohio we're told not to blow our whistles when the horn goes off to end a period. However, just because we don't blow our whistles, that doesn't mean a team can score after the horn.

So while I agree with the interpretation of the rule book, in actuality that doesn't seem to be true, and therefore those points can indeed be taken away.

You may not fully understand your instruction. When there is no try in flight at the expiration of time, then it is true that no whistle is necessary as the ball becomes dead upon the sounding of the horn. However when there is a try in flight as time expires, then the ball remains live until the try ends and at that point a whistle should be blown to signify the end of the quarter and that the ball is now dead.
Otherwise what the argument you are making is illogical. You are contending that the horn makes the ball dead in your area, but then stating that the officials can play on anyway and then come back and cancel the goal.
If any horn makes the ball dead in your state, then the play ends immediately and no goal can be scored. Btw that is counter to both the text of the NFHS Case Book and Official's Manual.