This happened to me coming back from Costa Rica. I was with my family in uniform. Was directed by the lady ushering people to use the crew line. I stated I had my family with me. She said it was OK. Got to the desk and the guy chewed me out and said he could take my ID away. I was just following directions. They would have had to pry my ID from my cold dead hands though. (I was using a normal passenger declaration form).