This has happened, extremely sporadically, in the past. It happened in Bangkok and was conducted by a police station (Thong Lor, I think) in conjuction with Immigration. I don't think they were specifically targetting overstayers, although I am sure they were over the moon every time they found one, but rather it was, surprise surprise, a rent-seeking exercise, in which everyone who had not got an up-to-date TM30 was fined. Something along the lines of a roadside checkpoint. The goal is to raise cash.
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