I really think it all depends on the airport
Like I said before in this forum,I went to Mexico last month and everything went smoothly..
When coming back I took the citizens line and someone told me to go to a line for " Reentry permits,RTDs" - by the way that was in LAX.
The office then DID NOT send me or take me to a "room", but asked me about my current address and my last address before this new one, It looked like he had it all in his computer.
He then stamped my RTD with "Asylum granted".. but didn't give an I-94....and let me go.