Illegality Doctrine Illegitimitätsdoktrin Illegality Doctrine Doctrina de la Ilegalidad Doctrina de la Ilegalidad Doctrine d'illégalité תורת הלא-חוקיות अवैधता डॉक्ट्रिन 違法主義原則 Doutrina da Ilegalidade 非法原则 The Illegality Doctrine is a legal defense used in civil litigation that argues that a plaintiff should not be able to recover damages if their claim is based on an illegal act or transaction.