Question

a law written in a state legislature does not have the authority to overide a law written into the constitution due to this article 6 clause

Answer 1

Answer: "This Constitution, and the laws of the United States which shall be made in pursuance thereof; and all treaties made, or which shall be made, under the authority of the United States, shall be the supreme law of the land"

This is the clause that limits state legislation from going against the constitution.