@Will ***********
That's not actually true. Unbeknown to me, a CM immigration person failed to stamp the new visa date in my passport. When I got to BKK, all hell broke loose and I was shouted at and threatened. There was a distinct absence of a Thai smile. And I had the CM receipt etc. I got fined and an overstay stamped in my pp. On another occasion I went to Hong Kong. When I got into CM, I was told to get on a plane back to HK. The assumption was that I was working as I had so many stamps in my pp. I was not. They made it clear that I had to pay a bribe. There were 5 of them. And this has happened to many, many people. (The bribe they like is about 2000 I believe. I didn't know that as I've never had to pay a bribe in my life and so ended up paying 4.