There's a famous Supreme Court case [1] in which a law that regulates how much wheat a farmer may keep for himself was determined to affect interstate commerce, and therefore be within the province of federal law.
Though this case was cited negatively by the Supreme Court many years later, it is still regularly cited in briefs — including by lawyers on both sides of the recent Obamacare cases.
So just because something seems local doesn't mean it couldn't fall within the Commerce Clause powers, as interpreted by the Supreme Court.
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There's a famous Supreme Court case [1] in which a law that regulates how much wheat a farmer may keep for himself was determined to affect interstate commerce, and therefore be within the province of federal law.
Though this case was cited negatively by the Supreme Court many years later, it is still regularly cited in briefs — including by lawyers on both sides of the recent Obamacare cases.
So just because something seems local doesn't mean it couldn't fall within the Commerce Clause powers, as interpreted by the Supreme Court.
1: https://en.wikipedia.org/wiki/Wickard_v._Filburn