Originally Posted by DoubleJ
My wife and I have also done this for the past 15 years with no problems, until two weeks ago coming into the US, the immigration officer said non-US citizen spouses could no longer accompany their US citizen spouses in the US citizen line, and directed her to the non-US citizen line. He added that if we wanted to stay together, a US citizen could accompany a non-US citizen spouse in the non-US citizen line.
This reflects my experience exactly. Mrs. David (German) and I (US) have always asked the IO doing the "traffic directing" at the beginning of the line, and until last year were always sent to the "US Citizens" line. Last summer, the "traffic director" (a uniformed IO) sent us to the US Citizens line, but the private security person at the head of the line said that was wrong and sent us over to the Non-Citizens line. Last winter (Xmas), the traffic director said that Mrs. David could no longer use the US Citizens line, because only the Non-Citizens lines have the cameras and fingerprint readers required for non-US citizens. So, we both used the Non-Citizens line. AFAIK, this is still the situation.