As an immigration law firm, The Law Offices of J Craig Fong in Los Angeles receives questions about "what does immigration know about me" or "what does the computer at the airport show."
As a matter of national security, this information is not officially made available; however, a recent discussion with a client has provided a few clues. A young, female client was entering the USA at an international airport, and the officers saw entries in the computer, and they knew:
* all of her entries to and exits from the USA,
* that she was a dual-citizen of a country in Europe and a country in South America,
* that she had used the South American passport before, and asked why she was using the European passport now,
* that she had a visa in the South American passport, and why she is not using that visa now,
* that the last time she came to America, she had a return ticket that she did not use, and why didn't she use it, and
* that when she was a student in America five years ago, she had a California driver license.
Immigration fraud is a serious matter, and the border guards have significant information about many people who enter the USA. --jcf