Exit stamp on passport when leaving US by bus [duplicate]

My wife is in the US on the VWP, and will be leaving the country by bus into Mexico after having arrived by air. I've taken this bus route multiple times, but have no memory of ever stopping on the US side of the border to get an exit stamp - but as a US citizen, I don't need one.

I know that when leaving the country by air, no exit stamp is necessary, because the air carrier communicates their passenger list to the US immigration service.

Is the same thing done on buses?

I can't imagine it is, as lax as the security/ID procedures are on buses.

If not, what must my wife do to ensure that her exit from the US is registered?

Or will her entry stamp into Mexico be enough to prove that she left the US if/when immigration ever asks her about it?

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Do they stamp your passport when you leave the US?

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 !

How does the US know when you leave the country?

The US processes passport details for all air passengers through a system called APIS, and ties that to the electronic I-94 (arrival and departure record). You can check your US arrival and departure history online. This allows you to verify their record of your departure.

Why my passport was not stamped upon entry to US?

My Passport Wasn't Stamped When I entered The US In 2022 The reason is because everything is becoming more digitized and so many paper processes are no longer required. In regards to the entry into the United States, immigration agents will not always stamp the passport, but they do record entry into the country.

Does passport get stamped entering US?

The I-94: Proof of Legal Entry into the United States When entering the United States as a nonimmigrant, the Customs Border Protection (CBP) officer examines your passport and visa and then issues either a passport admission stamp or a small white card called the Form I-94.

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Images: Uriel Mont, Dương Nhân, Laura James, Charles Parker