I caught the IC aspect. The States Rights aspect is relevant as well.
...Justice Stevens and the other majority justices saw the case as substantially similar to a landmark 1942 commerce-clause decision called Wickard v. Filburn, in which the high court upheld federal regulation of wheat production on a family farm even when the wheat was grown for home consumption.
"In both cases, the regulation is squarely within Congress' commerce power because production of the commodity meant for home consumption, be it wheat or marijuana, has a substantial effect on supply and demand in the national market for that commodity," Stevens writes.
"In assessing the scope of Congress' Commerce Clause authority, the court need not determine whether respondents' activities, taken in the aggregate, substantially affect interstate commerce in fact, but only whether a 'rational basis' exists for so concluding," he says..."
This is a states rights case.