 The shift in usage was first observed in the United States and the extent to which the term is used in U.S. jurisprudence and therefore the meaning attached to it has had the effect that it is rarely if ever used in a British courtroom.In the U.S. federal judicial system, a moot case must be dismissed, there being a constitutional limitation on the jurisdiction 
of the federal courts.The reason for this is that Article Three of the United States Constitution limits the jurisdiction of all federal courts to "cases and controversies".