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Res Judicata

18. What is “res judicata” in civil trials?

Res Judicata is a legal expression meaning that the legal dispute between the parties is decided. This principle prevents successive lawsuits involving the same facts or occurrence. A plaintiff may not sue the defendant for the same conduct under the same or a separate cause of action. The separate cause of action should have been raised during the initial trial. It brings the dispute to a conclusion.

•    Discussion: Compare the principle or res judicata to the principle of double jeopardy in criminal cases. How are they similar? Different?

•    Practice Question: Tom is suing Isabelle for assault. Isabelle allegedly approached Tom in a public restaurant and slapped him in the face. The jury returns a verdict of not liable on the grounds that Isabelle was temporarily incapacitated by rage at seeing her boyfriend having dinner with another woman. Tom is outraged by the verdict and seeks to sue Isabelle a second time for battery. Can Tom sue Isabelle for battery after losing the first trial alleging assault?

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