All these test

[GarthB]

Bottom line is that all state associations belong to the NFHS. A few state associations are run by IAABO chapters, but they also must belong to the NFHS and follow NFHS rules and rulings.

and

According to the NFHS web site, the FED lists member associations and have a presence in all 50 states. I don't know of any state that doesn't use NFHS rules as a basis for their high school basketball competition, including Washington.

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A presence is one thing. The state using FED rules in all sports is another.

I believe Texas uses NCAA rules for football. I believe Rhode Island and one or two other eastern states use OBR for high school baseball. I am not personally aware of any states that do not use FED for basketball, but it would not surprise me if there were.

There is no requirement that all states MUST use FED rules.