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Entrapment by estoppel: In American criminal law, although "ignorance of the law is no excuse" is a principle which generally holds for traditional (older common law) crimes, courts sometimes allow this excuse as a defense, when defendant can show they reasonably relied on an interpretation of the law by the public official(s) charged with ...
Entrapment is a practice in which a law enforcement agent or an agent of the ... The entrapment by estoppel defense exists in both federal and city jurisdictions ...
The courts have used direct estoppel to prevent a party from bringing the same cause of action several times. For example, in Peare v. Griggss, the appellate court reversed a judgment awarded to a widow-plaintiff because the direct estoppel doctrine prevented the plaintiff from receiving damages arising out of the same controversy.
Estoppel forms part of the rules of equity, which were originally administered in the Chancery courts. Estoppel in English law is a doctrine that may be used in certain situations to prevent a person from relying upon certain rights, or upon a set of facts (e.g. words said or actions performed) which is different from an earlier set of facts.
Legal jurisdictions which provide for apparent authority include the United States, the United Kingdom, Australia, Canada and South Africa.The doctrine of apparent authority is based on the concept of estoppel, thus, it prevents the principal from denying the existence of agency to a third party, provided that a representation, as to the agent's authority, has been made by him to the third ...
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 position in most common law jurisdictions (which follow England) is that if an issue is not barred by a finding of 'cause of action estoppel', or 'issue estoppel', the question then turns to whether an abuse of process can be established on the Henderson v Henderson line of authority. [11]
Legal estoppel is a principle of law, particularly United States patent law, that an assignor or grantor is not permitted subsequently to deny the validity of title to the subject matter of the assignment or grant.