It's not in the NFHS published mechanics manual. MR U. checks for 5 players 50-to-79 along with some other duties, Counting 7 on the line is not one of them.
Even if it was in the NFHS manual, my crew wouldn't use it because we are all NCAA officials and rely on our other training to assure at least 7 on the line. That simple procedure has been discused, beat to death in this fourm and in other forums.
We work as a team of four (R,U L and H) to get it right every time. It's not rocket science, we don't look like 3rd base coaches flashing signs across the field.
Bottom line in my opinion is do what works for you. If you find mistakes are still occurring, then it's time to think about a change.
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