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Actually, the Supreme Court is the only court in the land that isn't bound by precedent, even its own. It can overturn one of its earlier rulings any time it wants, although it seldom does. What it usually does instead is refine, narrow or broaden an earlier one.
We may not want the Court sticking too much to precedent; in 1943 it said, "Apparently, then, under the Second Amendment, the federal government can limit the keeping and bearing of arms by a single individual as well as by a group of individuals, but it cannot prohibit the possession or use of any weapon which has any reasonable relationship to the preservation or efficiency of a well-regulated militia."
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