Some of you do seem to cop it badly, that's for sure.
Re being picked for a swab or whatever, like waiting before letting tray
go through, I have often dawdled at the tray / item pick up point until
the selectors have picked someone else to swab / take away.
When they are all standing around doing nothing, that is the time
I reckon you are guaranteed to get done.
As someone else said, I wish they all had one standard and stuck to it.
.