Who has the final authority on the interpretation of federal law?

The Supreme Court holds the final authority on the interpretation of federal law. This is due to its role as the highest court in the United States, which has the ultimate judicial power to interpret the Constitution and federal laws. When cases involving federal law or constitutional questions arise, the Supreme Court’s interpretations set binding precedents that lower courts must follow. This function ensures a consistent application of federal law across the country.

While Congress creates laws and can amend or repeal them, its authority does not extend to interpreting how those laws are applied in the courts. State courts and federal district courts also play significant roles in interpreting laws, but their interpretations can be challenged and ultimately reviewed by the Supreme Court, reinforcing that the Supreme Court’s rulings are final and authoritative.