"Justice William O. Douglas used the term "penumbra" to refer to fundamental rights or liberties that aren't specifically enumerated in the Constitution, but can be inferred from the language in the First, Third, Fourth, Fifth, Ninth and Fourteenth Amendments. These rights are protected by the doctrine of substantive due process, an adaptation of the Due Process clauses of the Fifth and Fourteenth Amendments. The right to privacy is one example of such a right."
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