Certainly my recent, & admittedly unscientific, observations in places like LAS, DFW, & BOS, have shown false +'s to be significantly higher than what was found in Europe, judging by the #of pax who are getting some kind of grab/grope following their exit from the NoS.

Seems pretty clear to me that gumby doesn't really know what it's looking at any more than the human sitting in the perv booth did/does.