The United States Supreme Court's rulings apply to all levels of law enforcement (city, state and federal):

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The United States Supreme Court's rulings apply to all levels of law enforcement when it decides a case based on the United States Constitution and Bill of Rights. The Constitution and Bill of Rights are federal documents that apply to all levels of government. Rulings based on the Federal Rules of Evidence and the United States Code may only apply to federal cases and would not necessarily apply to state and local law enforcement agencies.

The United States Supreme Court's Rulings Apply to All Levels