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Simple English definitions for legal terms
common-nucleus-of-operative-fact test
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A quick definition of common-nucleus-of-operative-fact test:
The common-nucleus-of-operative-fact test is a rule that says a federal court can hear both federal and state law claims if they come from the same set of facts. This means that if a person has a problem that involves both federal and state laws, they can go to one court to solve everything. This is helpful because it saves time and money for everyone involved. The rule was made by the Supreme Court in 1966 and is still used today.
A more thorough explanation:
The common-nucleus-of-operative-fact test is a legal doctrine that allows a federal court to have jurisdiction over state-law claims that arise from the same facts as the federal claims providing a basis for subject-matter jurisdiction.
For example, if a person files a lawsuit in federal court claiming that their civil rights were violated, and also includes a state-law claim for assault and battery, the court may have jurisdiction over both claims if they arise from the same set of facts.
The purpose of this doctrine is to promote judicial efficiency by allowing all related claims to be heard in one trial, rather than requiring separate trials in both state and federal courts.