The slightly better version of the argument is that when a state not only decriminalizes marijuana but also enacts a comprehensive scheme regulating and taxing marijuana, that scheme undermines the federal regulatory scheme designed to prohibit marijuana and therefore the state regulations are preempted by federal law. Nebraska and Oklahoma tried to make a version of this argument in their suit against Colorado, but SCOTUS through out the case without giving an opinion.
If anyone has standing on that argument, it's the Federal government, not a State government. The very last thing the court should be doing is ruling that a State has to alter its law to make it easier for another State to administer its own laws.
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