gn123,
At POE (Dulles), I was asked to go in a separate room for SEcondary Inspection. There were ~20 more people. Waited for nearly an hour (due to officer working very slow). And he stamped my AP in 2 seconds and gave to me.
As an aside,
It's another matter, that I was the last person on my flight to pick my baggage (1 of 2). The 2nd bag reached home a day later with broken zipper.