What is not allowed under the principle of double jeopardy?

The principle of double jeopardy is enshrined in the Fifth Amendment of the U.S. Constitution, which protects individuals from being tried twice for the same offense after an acquittal or conviction. This means that if a person has been acquitted of a crime, they cannot be retried for that same crime, regardless of the evidence that might emerge later. Therefore, being retried after acquittal for the same offense is not permitted under this legal doctrine.

Understanding double jeopardy also clarifies why the other options are permissible under the law. For instance, being tried for different but related crimes is allowed because these are considered separate offenses that do not violate the principle of being tried for the same crime. Additionally, appealing a conviction is a different legal process that does not constitute a retrial for the same charges, as it is part of the checks and balances in the judicial system. Finally, being tried in federal and state courts for the same act is permissible under the dual sovereignty doctrine, as federal and state governments are considered separate entities. Thus, these actions do not conflict with the double jeopardy protections.