And much of that precedent is from the New Deal era. http://en.wikipedia.org/wiki/Commerce_Clause#New_Deal http://en.wikipedia.org/wiki/Commerce_Clause#New_Dea

And much of that precedent is from the New Deal era. http://en.wikipedia.org/wiki/Commerce_Clause#New_Deal http://en.wikipedia.org/wiki/Commerce_Clause#New_Deal Edit: In the case you posted, I think this excerpt from Justice Thomas' dissent sums it up nicely: If the Federal Government can regulate growing a half-dozen cannabis plants for personal consumption (not because it is interstate commerce, but because it is inextricably bound up with interstate commerce), then Congress' Article I powers – as expanded by the Necessary and Proper Clause – have no meaningful limits. Whether Congress aims at the possession of drugs, guns, or any number of other items, it may continue to "appropria[te] state police powers under the guise of regulating commerce."