Collateral estoppel

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Collateral estoppel (CE), known in modern terminology as issue preclusion, is a common law estoppel doctrine that prevents a person from relitigating an issue. One summary is that, "once a court has decided an issue of fact or law necessary to its judgment, that decision ... preclude[s] relitigation of the issue in a suit on a different cause of action involving a party to the first case".^[1] The rationale behind issue preclusion is the prevention of legal harassment and the prevention of overuse or abuse of judicial resources.