I dunno either....
Just about every time we go thru the 'frame with no door', Mrs G gets asked to submit to the 'random test'......
I have been 'selected' only ONCE! ('Honest' face I guess....)
I dunno what they are looking for, 'cause she is white, Caucasian, usually smiling....and, did I say of 'Welsh' origin.
Perhaps that's it!
Its going to be a 'problem' one day, as she is a very keen gardener, and if its the day after she's been 'doing the roses'....
CHEERS to all 'screeners'....
Keep smilin'....