Federal law trumps state law no matter what side the state law takes. Any
normal judge would just say that a rule already exists to address the
issue
so state level action is a waste of time and taxpayers money.

But local jusisdictions (state/county etc) can't enforce federal law.
Having a local ordinance that mirrors the federal allows them to enforce it.

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KC6ETE Dave's Engineering Page, www.dvanhorn.org
Microcontroller Consultant, specializing in Atmel AVR