Duh! Tommy Thompson isn't Caesar! It has to be ran through the Congress. Indiana, Missouri, and Kentucky will have concerns about this because they'll likely lose business. Here is "the people" signing the petition to Congress from the link:
If you think Congress and the FDA should allow Americans to purchase safely imported prescription drugs from Canada, please sign our electronic petition.
Please provide an example which meets the criteria that you set forth.
It's a perfect example. You just choose to ignore anything that proves you wrong, a common trait of neoconfederates. Remember how you guys were ignoring the stories of Confederate rapes against their own women.
International trade is, of course, a power ceded to the fedgov through the Constitution. This is right and proper. How does this relate to the acts of states being proved as stated in Article IV?