If a flight instructor, CFI or airport authority asked me for my documents, i have nothing to hide, i would willingly show them!
I don't know, A long time ago back at my local field I had the misfortune of being the target of a young chap whose talents were completely squandered being a flight instructor, his repeated enquiries as to where I was going, what I was doing and did I have my paperwork (all of which were none of his business) married up rather well with the attributes necessary to be a concentration camp gaurd. Trying to appease him just seemed invite more annoyance with me eventually having to provide him with a specific instruction that involved both sex and travel, which brought future interactions to a halt. He never did get that airline job he was always yabbering on about, last I heard he was running a chippie in Fife. The aviation business seems to have a way of separating the wheat from the chaff.