As it says on the tin. The first stamp seems to seal the deal even though you can question and examine.
1 Answer
If you stamp a passport with both stamps, the red stamp always takes precedence and the person has to leave. This means that if you accidentally approve someone but still have their passport, you can reject them. There is no penalty for this.
Once you have given the stamped passport to the entrant, it is impossible to ask for it back, even if you later find an error.
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1And implied from that, if you accidentally denied a valid applicant, there's no way back: prepare for the penalty. Glory to Arstotzka.– iBugMay 24, 2018 at 16:33