I once went to an interview at a school in BKK that just didn't go right, or more exactly didn't feel right (and feeling is very much the operative word). I felt very uncomfortable with the way the questions were going (example: our children stay at teachers houses: it was a day school), to the degree that I felt that I should ask a few questions of my own.
My first simple question was "what are your qualifications and experience(s) in education, I was curious and wanted to dispel any misunderstanding in either understanding what exactly was going on or language misinterpretation ( however, the interviewer spoke reasonable English).
Cutting to the chase... The interviewer exploded (odd for a Thai) into a rant about foreigners, us poor Thai's, exploitation, on and on, and so on. He ended up foaming at the mouth (not a pretty sight), but he had nice new beamer in the car park (he made a big thing about it in the initial stage of the interview (and yes, it could well have been on credit)
To be honest I started to laugh at these antics and told him, thank you very much for the interview and I'll be touch, once I had checked him out with the Thai police and educational authorities (pure bluster on my part). His retort was to say 'not to do that and that he was under a lot of strain'.
So, although background checks maybe become par for the course, who will pay for them, who will do them and what exactly do they mean (we haven't caught you yet! Or what?). And who does what with the collected information...
In all honesty background checks in general just like references are no guarantee of future actions and IMO remain of little value.