Does USPS check packaging?

If the package is not classified as Priority Mail Express™ service (domestic or international), Priority Mail® service, First–Class Package Service™, or an international letter package, it may be opened and its contents examined.



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Sending controlled substances through the mail (without a license) is illegal. Whether you send drugs or another banned substance through the U.S. postal system or a private carrier, it is always illegal.

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Identifying suspicious packages and envelopes
  • Excessive postage.
  • Handwritten or poorly typed addresses.
  • Misspellings of common words.
  • Strange return address or no return address.
  • Incorrect titles or title without a name.
  • Not addressed to a specific person.


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