Arrived at IAH on ANA from NRT last month. Immi would not allow Green Card Holders in U.S. Citizen line. I argued since Mrs. EX is my wife with the GC and I am holding U.S. Passport that we go together thru the Citizen line, That was denied. So I lined up with her at the visitor line which of course was much more crowded. Has never happened to us at any other U.S. POE. Will definitely avoid IAH in the future and hope this does not spread.