Every day, a lot of shipping packages and merchandise are examined, detained, and seized from the U.S. Customs and other law enforcement officers during checks at the airports, seaports, and other border crossings.
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Under the USPS Inspection Service inspection guidelines, first-class letters and packages are protected under the Fourth Amendment. This means that they cannot be searched or seized. The only way that an item sent through USPS can be seized and searched is with a search warrant.