There is no constitutional right for you to sell pork in California. California has a right (just like any other state) to pass the laws they see fit for their state. If you don't want to comply, then you don't sell to California residents. Not that complicated.
As far as enforcement, California can simply observe through video cameras.
Again, if you don't like it, then don't do business with California.
It's a free country people.
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