Do you need your passport stamped when leaving USA?
As there is no specific CBP interview or check by any customs officers as part of the exit process, no one will put an US Exit stamp on your passport. Your passport will only have the entry stamp from Port of Entry, that's about it. No US exit immigration stamp !
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What appears on their screen is basically all the information they have about you. All your travel history to and from that country. The consular officer's note when you were interviewed. Everything written in your passport, including identifying details and any travel history it contains.
All U.S. citizens need U.S. passport books if re-entering by air. Land and sea border crossings accept additional travel documents, such as U.S. Passport cards and Trusted Traveler cards. Child travelers have additional options - see the Traveling with Children section.
Thus, the penalty is the possibility of denied or delayed entry into the US, as well as the associated costs (e.g. missing connecting flights or meetings).
If your passport's time is almost up, don't wait — start the renewal process now. You can't travel while your renewal application is being processed, and you need to make sure your travel documents are valid for at least six months past the dates of any planned international trips.
U.S. nationals, including U.S. dual nationals, must use a U.S. passport to enter and leave the United States. U.S. dual nationals may also be required by the country of their foreign nationality to use that country's passport to enter and leave that country.