Marijuana was legalized in contravention to federal law

The supremacy clause of the constitution asserts that federal law takes precedence over state laws. There are thousands of state laws on the books that are basically rendered null, because a federal law overrides it. One clear example is segregation which was on the books in some states decades after the civil rights movement.

The federal government and DOJ has declined to prosecute Marijuana, but they definitely have the right to do so.

> One clear example is segregation which was on the books in some states decades after the civil rights movement.

Some states took over a decade after Brown v Board to actually integrate school systems. So again, another instance of state laws seeming to trump federal laws.

If the idea is just not enforcing the supremacy of federal laws is enough, then not enforcing the federal law over the state law which bar sharing info with federal agencies is also in place here so far

No -- states repealing their own laws against marijuana have nothing to do with federal law, and do not prevent the feds from enforcing their own laws in any way. The states are not obligated to implement their own policies in order to further federal interests, nor to participate in the enforcement of federal law.

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