I've been reading this and other forums for about 20 years now. In that time I haven't read all that many reports from people claiming they were randomly stopped by the cops and asked to produce their passport.
When it does come up it seems to be, as usual, all about location, location, location. Eg. many years ago there were a bunch of reports on here of members getting hassled by the cops in a specific area of Thonglor. Iirc Big Jok might have shut that nonsense down.
On the very first page of this thread, RafPinto says he was recently stopped whilst out driving in Pattaya and asked for his passport (DL not good enough).
Sounds like he might have got caught up in Pol Maj Gen Suwanlaong's little "crackdown".
I simply refuse to believe that all those reports are made up. If that's the case then every word on this forum is a lie.
So there's no doubt in my mind that from time to time foreigners will be randomly stopped and asked for their passport, even though I have never been asked myself.
I did however show a policeman at an APEC checkpoint a photo of my passport on my phone (I don't have a DL etc), and the swipe card from my condo. I don't really care for trying to be difficult in those types of situations so I had the pic ready as the motosai was pulling up to the checkpoint.