Originally Posted by
FlyingHoustonian
It has been argued this gives the states full reign with regard to alcohol thus CBP enforcing said laws.
Not just "argued". In
State Board v. Young's, the Supreme Court more-or-less signed off on states having all sorts of power to do things normally forbidden to them, so long as it involves regulating alcohol.
More recently they've started to walk back some of that, ruling that the 21st Amendment didn't remove states' obligations of equal protection under the 14th, and chipping away at the power to treat in- and out-of-state sources of alcohol, but
State Board still hasn't been overturned.