So the CC deals with economic and noneconomic activity and the DCC deals only with economic activity?
Basically, federal law trumps state law?
This is practically all we talked about all semester. It was godawful, but I am at least now well-positioned to throw in some BS in an effort to help elucidate.
Federal law ALWAYS trumps state law, if they conflict. The source for this arrogance is the Supremacy Clause in Art. VI of the Constitution.
The CC allows Congress to regulate three areas of interstate commerce:
The channels of commerce (essentially commerce itself. Annoyingly circular, self-referential verbiage)
The instrumentalities of commerce (waterways, airfields, railroads, powerlines, etc.)
Activities which have a substantial impact on interstate commerce.
This last one is the most creative and is what Congress and the courts use to regulate non-economic activity. They use it as the source of their authority to enact laws like the Violence Against Women Act referenced above, asserting that domestic violence against women has a substantial impact on interstate commerce in that women who are victims of violence can't freely travel from state to state or some *&^%. It was mightily tenuous, and the Supreme Court said nice try but no dice.
Sometimes it works, though, like when a few people in California grew their own medical marijuana (legal to possess in CA). The feds arrested them, or destroyed their half-dozen plants - I forget - and the SC upheld the conviction under a federal law based on the commerce power. They held that this individual grower might not affect interstate commerce - indeed they weren't engaged in commerce AT ALL - but if you multiply this buyer by the zillions of others that would pop up if allowed, the market would be flooded with weed and interstate commerce would go berserk. Therefore, in the aggregate, this grower has a substantial affect on IC and can be regulated by Congress/federal law.
As for its Dormant retarded cousin, states are authorized to regulate commerce within their borders, but if they cross state lines and attempt to regulate INTERSTATE commerce, the feds get annoyed. There are lots of tests and variables to determine if a state law violates DCC, but in general, economic protectionism of a state's own citizens is almost always an invalid justification for discriminatory state laws (discriminatory against out-of-state commerce, that is, not protected classes of citizens).
I can go on, if this leaves you wanting more...