A Supreme Court decision is only irrelevant in two ways. The first is "de facto". This is when a decision is obviated by the fact that it no longer has any practical meaning. For instance, let's suggest that the Supreme Court once ruled on the use of debt sold by the government from 1800 to 1810. Now in 2008 that debt has either no value or no longer exists, so the law pertaining to that simply does not matter. De facto is latin for "in fact" or "in practice".
The more common and controversial way is when the Court overrules a previous decision. This happened with Plessy v Ferguson and then Brown v Board of Education. In Brown v Board, the Court decided that its earlier decision of Plessy was a mistake so it was struck down and thus became irrelevant.
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In most cases a Supreme Court decision is permanent. The current Supreme Court can change the decision of a previous Supreme Court.
The Supreme Court must have a simple majority to render a decision in a case.
A U. S. president cannot reverse a U. S. Supreme Court decision or the decision of the Supreme Court of any state or territory.
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The Supreme court decision on Marbury version Madison by the federal judiciary. This is part of the court systems.