On a side note, was there ever a 10th Amendment case? Obergefell and Windsor both had a logical 10th Amendment argument. Was it ever even raised?
J
The 10th is really not seen as significant, especially with the 14th in place.
The Tenth Amendment, which makes explicit the idea that the federal government is limited to only the powers granted in the Constitution, has been declared to be a truism by the Supreme Court. In United States v. Sprague (1931) the Supreme Court asserted that the amendment "added nothing to the [Constitution] as originally ratified."
States and local governments have occasionally attempted to assert exemption from various federal regulations, especially in the areas of labor and environmental controls, using the Tenth Amendment as a basis for their claim. An often-repeated quote, from United States v. Darby Lumber, 312 U.S. 100, 124 (1941), reads as follows:
The amendment states but a truism that all is retained which has not been surrendered. There is nothing in the history of its adoption to suggest that it was more than declaratory of the relationship between the national and state governments as it had been established by the Constitution before the amendment or that its purpose was other than to allay fears that the new national government might seek to exercise powers not granted, and that the states might not be able to exercise fully their reserved powers.
https://en.wikipedia.org/wiki/Tenth_Amendment_to_the_United_States_ConstitutionThe Supreme Court rarely declares laws unconstitutional for violating the Tenth Amendment. In the modern era, the Court has only done so where the federal government compels the states to enforce federal statutes. In 1992, in New York v. United States, 505 U.S. 144 (1992), for only the second time in 55 years, the Supreme Court invalidated a portion of a federal law for violating the Tenth Amendment. The case challenged a portion of the Low-Level Radioactive Waste Policy Amendments Act of 1985. The act provided three incentives for states to comply with statutory obligations to provide for the disposal of low-level radioactive waste. The first two incentives were monetary. The third, which was challenged in the case, obliged states to take title to any waste within their borders that was not disposed of prior to January 1, 1996, and made each state liable for all damages directly related to the waste. The Court, in a 63 decision, ruled that the imposition of that obligation on the states violated the Tenth Amendment. Justice Sandra Day O'Connor wrote that the federal government can encourage the states to adopt certain regulations through the spending power (e.g. by attaching conditions to the receipt of federal funds, see South Dakota v. Dole, 483 U.S. 203 (1987), or through the commerce power (by directly pre-empting state law). However, Congress cannot directly compel states to enforce federal regulations.
In 1998, the Court again ruled that the Brady Handgun Violence Prevention Act violated the Tenth Amendment (Printz v. United States, 521 U.S. 898 (1997)). The act required state and local law enforcement officials to conduct background checks on persons attempting to purchase handguns. Justice Antonin Scalia, writing for the majority, applied New York v. United States to show that the law violated the Tenth Amendment. Since the act "forced participation of the State's executive in the actual administration of a federal program", it was unconstitutional.