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Collateral Estoppel

Collateral estoppel is an important doctrine in the fields of criminal law and civil procedure.

In criminal law, collateral estoppel protects criminal defendantsfrom being tried for the same issue in more than one criminal trial through the double jeopardy clause of the Fifth Amendment. As established in Benton v. Maryland, collateral estoppel is binding on both federal and state governments through incorporation by way of the Due Process Clause of the Fourteenth Amendment.

In civil procedure, collateral estoppel refers to the application of res judicata principles through issue preclusion. For issue preclusion, a party can utilize collateral estoppel to prevent another party from re-litigating any issue that has been validly, finally, and actually determined on the merits in a previous case.

In deciding if any given issue has already been determined, the court will consider whether that issue was essential to the previous holding. Under this test, any issue previously raised in court which would change the outcome of the case had it been decided differently is deemed actually determined.

Validity and finality for the purposes of collateral estoppel are determined by whether the first case would survive a collateral attack. Common reasons why a case may not survive a collateral attack include a lack of personal jurisdiction, a lack of subject matter jurisdiction, and a failure of due process in the first case.

There are two forms of issue preclusion/collateral estoppel - offensive and defensive:

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