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Sources of law
In the United States， the law is derived from four sources. These four sources are constitutional law， statutory law， administrative regulations， and the common law （which includes case law）。 The most important source of law is the United States Constitution. All other law falls under， and is subordinate to， that document. No law may contradict the Constitution. For example， if Congress enacts a statute that conflicts with the Constitution， the Supreme Court may find that law unconstitutional， and declare it invalid.
Notably， a statute does not disappear automatically merely because it has been found unconstitutional； it must be deleted by a subsequent statute. Many federal and state statutes have remained on the books for decades after they were ruled to be unconstitutional. However， under the principle of stare decisis， no sensible lower court will enforce an unconstitutional statute， and any court that does so will be reversed by the Supreme Court. Conversely， any court that refuses to enforce a constitutional statute （where such constitutionality has been expressly established in prior cases） will risk reversal by the Supreme Court.
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