"The Federal Government may enact a tax on an activity that it cannot authorize, forbid, or otherwise control."
J. Roberts
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"Where necessary to make a regulation of interstate commerce effective, Congress may regulate even those intrastate activities that do not themselves substantially affect interstate commerce."
J. Scalia, concurring in Raich
And I reject the notion that case law is superior to Constitutional law. In fact case law is doomed to failure more oft than Constitutional law because it depends on rulings which cannot themselves be guaranteed correct.
The two are now mutually exclusive as the case law now has the exact opposite of what the Constitution says as "constitutional."
The commerce clause is embedded in "with Indian tribes" and "with foreign nations", to hold that intrastate commerce is sufficient impactful of interstate commerce to allow its regulation is to say that a foreign country's internal commerce may likewise be regulated by Congress. This is absurd on its face, and would rightly be considered an act of war by that foreign state.