Have had it several times & don't question it. Nice surprise every once in a while. Last time was in Sept. on a flight home from NC, the day the Chicago area flights were shut down by the fire. Didn't impact me but I still got the prescreen status. A woman next to me in line had to rebook her flights & "lost" her prescreen for her original flights. She had to go through the regular line. One of those "go figure" things.