Can a US citizen be denied entry?

No citizen of a country can be denied entry to their home country. It is the internationally recognized “right of return.” Upon return they can be detained on customs issues or arrested on new charges or outstanding warrants but they cannot be denied reentry.



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Here are some steps you should take if you are detained at the airport by immigration:
  1. Ask to speak with an immigration attorney and do not sign anything until you speak to an attorney. ...
  2. Do not take a voluntary departure without speaking to an attorney. ...
  3. You have the right to contact an attorney or your family.


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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).

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Do not go off on tangents or tell your life story. Only answer the question that is being asked and do not provide more details than necessary. Remember, the immigration officer is doing many interviews a day, and you do not want to annoy them.

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The TSA checks passengers' identity and whether a passenger has a boarding pass; generally, they are not screening for immigration status.

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