Double Jeopardy Clause
Dual sovereignty doctrine

We have here two sovereignties, deriving power from different sources, capable of dealing with the same subject matter within the same territory. Each may, without interference by the other, enact laws to secure prohibition, with the limitation that no legislation can give validity to acts prohibited by the amendment. Each government in determining what shall be an offense against its peace and dignity is exercising its own sovereignty, not that of the other.It follows that an act denounced as a crime by both national and state sovereignties is an offense against the peace and dignity of both and may be punished by each. The Fifth Amendment, like all the other guaranties in the first eight amendments, applies only to proceedings by the federal government (Barron v. City of Baltimore, 7 Pet. 243), and the double jeopardy therein forbidden is a second prosecution under authority of the federal government after a first trial for the same offense under the same authority. (The Barron precedent was superseded 35 years later by the 14th Amendment)
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