There's a new process at Dulles (IAD), and I've updated the wiki accordingly.

Now after using the kiosk you wait in line immediately to give your slip to the CBP agent, who will ask (or you tell) about any declarations. Once you're past that check, you proceed to baggage claim or the exits with no further checks.

A couple of observations, which I got to make because the agent was spending a lot of time with a single person, who may have been a foreign national who had to through an initial first time extra check:

1) the row of kiosks along the far wall (the original location for IAD regulars) now can get blocked by the line for the CBP agent if that line moves at all slowly. IAD may need to reevaluate

2) I'm not sure what happens if your checked luggage has goods that need to be reviewed

3) The single door out to baggage claim is poorly positioned to facilitate a quick GE getaway . . . you have to walk back to nearly the middle of the CBP area only immediately to turn in the other direction once through the door to reach the exits.