Generally Federal Law means the body of law created by the federal government of a country. In US, Federal law is the body of law consisting of the U.S. Constitution, federal statutes and regulations, U.S. treaties, and federal common law. The Federal law is the supreme law in US and overrides state law whenever there is a conflict. [Article IV, Section 2 of the U.S. Constitution.] United States federal laws are codified in the United States Code. The U.S. Supreme Court makes final decisions regarding all the federal laws.