Palko v. Connecticut, 302 U.S. 319 (1937), was a United States Supreme Court case concerning the incorporation of the Fifth Amendment protection against double jeopardy.
Justice Benjamin Cardozo, writing for the majority, explained that some Constitutional protections that would apply against the federal government would not be incorporated to apply against the states unless the guarantee was "implicit in the concept of ordered liberty". Incorporation of the Bill of Rights was selective, not a general rule, and in this case the Court declined to incorporate the protection from double jeopardy against the states, even though the protection would most certainly have been upheld against the federal government.
