The constitutional doctrine that certain fundamental rights are protected from government interference regardless of the procedures used, requiring that laws have a legitimate purpose and not be arbitrary. It protects the substance of rights, not just the process of their deprivation.
From Latin 'substantivus' (relating to essence or substance) combined with 'due process.' The doctrine evolved from 19th-century interpretations of the Fifth and Fourteenth Amendments, moving beyond procedural fairness to protect substantive rights from governmental overreach.
Substantive due process is one of the most controversial doctrines in constitutional law, protecting everything from economic freedom in the Lochner era to privacy rights in modern cases like Roe v. Wade! Critics call it judicial activism because it allows courts to identify fundamental rights not explicitly mentioned in the Constitution, while supporters argue it's essential to protecting liberty from majoritarian tyranny.
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