NFHS closely guarded rule

[Coach Bill]

Regarding the closely guarded rule:

I had an official tell me that he NFHS rule book only says closely guarded, and no mention that a player has to also be within 6 feet. He said that distance doesn't matter, and that closely guarded is up to official's judgment.

I know the defender has to remain within 6 feet to maintain the count, but I don't know the rule/case reference. Could someone please post it?

Thanks.