If a state bans the sale of milk that is not produced by cows in the state, the ban will probably be upheld as constitutional because it helps ensure the freshness of milk.

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This type of ban would likely violate the Commerce Clause of the U.S. Constitution, which prohibits states from enacting laws that discriminate against interstate commerce. Such a ban would favor in-state producers over out-of-state producers, and would likely be struck down as unconstitutional. The argument about ensuring milk freshness would not be sufficient to overcome this constitutional issue.

If a State Bans the Sale of Milk That Is