When something has already occurred, you can use it as a legal standard to start matching if you favor the decision made in the case; this is referred to be precedent.
Controlling precedents are referred to as "binding authority" in a jurisdiction. Any legal authority that a court must abide with while making a decision is known as a binding authority. Persuasive authority: Courts frequently use persuasive authorities (case law from other jurisdictions) while making decisions in first-impression matters. Occasionally, a court will veer from the rule of precedent if it determines that it should no longer be obeyed. This is known as a departure from first impression. A court may make a decision that differs from a precedent if it determines that the precedent is simply inaccurate or if social or technological advancements have rendered it irrelevant.
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