When the U. S. Constitution says "federal law is the supreme law of the land" what does that mean?

The Supremacy Clause is a clause within Article VI of the U.S. Constitution which dictates that federal law is the "supreme law of the land." This means that judges in every state must follow the Constitution, laws, and treaties of the federal government in matters which are directly or indirectly within the

Explanation:

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new evidence is discovered.

oversights and errors are corrected,

new technology is applied to evidence.