I suspect that one secret feature of this app is a discreet way to override the randomizer and send a passenger to the "intrusive search" lane. That is, if the

I suspect that one secret feature of this app is a discreet way to override the randomizer and send a passenger to the "intrusive search" lane. That is, if the screener suspects someone, he or she can swipe or click in a clandestine way to guarantee that the passenger gets the annoying search. The passenger can't complain about being targeted or profile or singled out, because, hey, it's random. (The actual rationale of the randomizer might have been to avoid accusations of profiling, while still being able to do profiling. Leaving the bad guys off balance is simply a benefit.)