First, does the FTCA's discretionary function exception immunize the United States from liability for torts committed by its law enforcement officers in the routine performance of their duties? Second, can the United States invoke the Supremacy Clause of the Federal Constitution to defeat a claim under the FTCA—a federal statute?

Whether the Supremacy Clause and the discretionary function exception of the Federal Tort Claims Act can immunize federal law enforcement from liability for executing a mistaken search warrant at the wrong residence