There is, in spycraft, a type of professional known as a Gray Man, so-called because they're almost impossible to spot.

dot-com bubble

They were led into a large, attractive room with twin massage beds, and welcomed by their masseurs—in Balinese tradition, he had a male masseur, Anna a female. He drowsed his way through the first half hour of the treatment, […]

I drank two cups of water but still felt thirsty.