I called into the program on my way to work and explained that this isn't crazy, nor is it nullification. The U.S. Supreme Court in Printz v. U.S. (1997) held that the Tenth Amendment means that state and local officials are not obligated to enforce federal law:
We adhere to that principle today, and conclude categorically, as we concluded categorically in New York: "The Federal Government may not compel the States to enact or administer a federal regulatory program." Id., at 188. The mandatory obligation imposed on CLEOs to perform background checks on prospective handgun purchasers plainly runs afoul of that rule.