United States Postal Inspection Service

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Noun1.United States Postal Inspection Service - the primary law enforcement arm of the United States Postal ServiceUnited States Postal Inspection Service - the primary law enforcement arm of the United States Postal Service
United States Postal Service, US Postal Service, USPS - an independent federal agency that provides mail processing and delivery service for individuals and businesses in the United States
independent agency - an agency of the United States government that is created by an act of Congress and is independent of the executive departments